It is difficult to consider the influx of companies to btc as a "pump and dump scheme". Every visionary knows that the world is constantly evolving and changing, and since the start of the digital world (internet) that sooner or later, a new digital currency was bound to surface.

The btc train is a moving train, and most companies and individuals with enough resources are looking to join in and catch the gains, before the price value becomes stable. So i will say to the best of my understanding that to them, "Btc is considered a long term investment".

You cant be sure if there won't be a crash soon. When they say history repeats itself, it doesn't mean only the bull run will repeat itself but also the long bearish market. Despite Bitcoin going mainstream and the institutions buying BTC the market will saturate and everyone will cash out their money for the next cycle.  But I can agree BTC is a long-term investment, the early investors has no fear of whatever the market will do.

Bigger news for me is the new Canadian Bitcoin ETFs that started trading last week and have already taken $500m from *retail* investors.

The next big step for Bitcoin is when a US Bitcoin ETF gets approved.

We really are now in a situation of a gang of guys in a bar randomly talking about Bitcoin on a Friday night and buying their first $100 of it within seconds on their cellphone for the hell of it, like they would do Amazon shares for example.

(well maybe not when the stock market is closed, but you get my point   )

Clearly their move at the foresight, McroStrategy still manages to incubate bitcoin for the future, Elon, Tesla ... Those are just a few prominent organizations, millions of organizations, individuals selling  other odd.  They see an independent ecosystem that is potentially inflation free and lagging behind. It’s bitcoin.  The crypto market itself is risky but that ratio has improved a lot over time.  
The dependence between bitcoin and crypto is a powerful bond.  I think this will cycle the most prosperity that we will see in the future.

Bitcoin and crypto is hardly mainstream even with these institutional investors flocking. Microstrategy already accumulate a large sum of bitcoin last year so they are no stranger to the crypto world already. In fact they have the most amount of bitcoins, even more than what Tesla has accumulated. I'm more interested on which other industries will be coming in, more specifically those who are more conservative. Square Inc. bought about $170M BTC just recently as well. Companies like these most probably buy BTC for the long term knowing the potential behind it and not for a pump and dump. They are trying to get ahead of the game before bitcoin is utilized in the mainstream. IF they were to do it for a pump and dump, they wouldn't have announced it to the public like that. Now that they own BTC, all eyes are on them. There may not be any written down legal implications but the last thing they'll need is the SEC on their tail if they perform a pump and dump.

it can be a pump plan. these companies buy bitoin and then hordes of people follow them in bitcoin purchasing, then bitcoin price goes up. one year ago, I bought bitcoin in the wake of a company, then the price plunge then I sold it and lost money in dump. make judgement by your own knowledge(so you must learn to accumulate knowledge), not be driven by others

That is why I said it is subtle and legal type of pump and dump scheme. The problem with what you did is you followed what the public does, if a panic in the market is happening, you have to do the opposite, if everyone is selling, it means that the prices are going down and you can use that opportunity to buy more bitcoin at a lower price and if the other happens where many are buying, you sell yours because you will get a big profit.

It is good to see that many large companies are buying bitcoin, but the old problem of this market continues to haunt and destroy the image of this cryptocurrency market. the old problem I'm talking about Is Pump and Dump.

for example:

when posted news about tesla the bitcoin price was less than $40,000 and  tesla had already bought bitcoin and days or weeks so why did the price increase to $48,000? it was the old pump and dump scheme that took advantage of the news of tesla, then there was another news that I no longer remember that also brought the price up to $58000

They are not taking the risk if they are not sure what will possibly happen in the future. Elon Musk is so optimistic, a positive person will likely see the massive growth of crypto users, and this what they are preparing for.
But now, the challenge is how these small investors and average people could buy Bitcoin when the price is expensive? And much more if the price will be doubled $100k, I keep fiat instead.

It is true that many companies investing in Bitcoin make Bitcoin's popularity increase. And this makes many people start investing in Bitcoin,
no wonder the increase in the price of Bitcoin is also getting faster. Then regarding companies that decide to invest in Bitcoin, I think they are
doing this for long-term investment. Because if they intend to do a pump and dump there will be a crash in the Bitcoin market, but until now
the Bitcoin price has only experienced small corrections. This proves that companies investing in Bitcoin for long-term investments.