Elon musk is so much into cryptocurrency, because he knew the worth of the digital currencies. So that, he invested in bitcoin.

IMHO, I think it's not bad because Tesla is a big company, and buying bitcoin with that amount brings more positive results on Bitcoin price as we experience nowadays, So overall it's not bad I believe that Tesla knows that Bitcoin and other cryptocurrencies are very volatile that's why they are aware of the risk associated in it.

By the way, they said that Elon Musk is manipulated the market, What kind of manipulation? Manipulation in a form of a tweet? I dont think so, what I believe is that investors are already aware of what they are doing and because cryptocurrency is very speculative in nature and investing in it is like a gamble. I think that was the reason they want(investors) to gamble, thats why invest only that you can afford to lose.

I think it is good that the Tesla buys 1.5b worth of bitcoin because of this happening the bitcoin arise and set a new ath and due to this happening many people gets more interested on bitcoin. The mass adaptation that has been brought by buying 1.5b of bitcoin by tesla makes the new all time high of bitcoin and still the hype of it is there that's why the bitcoin is continuing to pump up. Overall I am seeing this as a good thing, because this become an eye opening to everyone.

Personally I believe in the freedom of speech and no man, famous or not, should be denied the right to express himself no matter the subject. It is a free market after all and we are all supposed to be grown-ups. People who invest based on other people opinions need to learn the lesson as soon as possible or else they would find the consequences of not doing due diligence at 30-50 years old where the risk is much bigger.

If Elon believes in Bitcoin, it is common sense for that to reflect both on Tesla's balance sheet and on his social media. I do believe Musk is going to start a trend in corporates and not only. I mean why not  expose at least a few percentages of the cash in your company on an assymmetrical risk reward opportunity that also happens to have strong fundamentals and price history?

Remember, do your own diligence and practice sound risk management.

They think it will help with more Flexibility and at the same time increase the cash returns .

BUT what am worried about is :
The market manipulation by Elon Musk that did happen this month on twitter , it was not only bad but at the same time it could mean that he plans to do such things in the future.

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I doubt he has "manipulated" the market. At least not yet. We could say he is manipulating the market if he started promoting crypto currencies after tesla invested in bitcoin. We have been seeing him being a big fan of crypto currencies and promoting them before all these happened.
But who knows what his intention might be. Maybe he is testing the market to see how much influence he can extert before starting to make profit out of it. But lets all take it in a positive way. Let us imagine he is a good guy trying to promote the usage of crypto currencies.

I do not know why OP want us to compare whether Tesla buying bitcoin is good or bad. The action is a plus for bitcoin and that is evident the way the price is rushing to attain new all time high. Today price went to $50,000 and that is beyond widest expectation. Nobody believed price will get this far from the way the coronavirus pandemic destroyed economic activities from 2020 till now. It is even looking like it will go higher in days ahead. Tesla's involvement is timely and good support.

I think Tesla's purchase of BTC is certainly very good and is probably a signal to other big companies that it's time to buy cryptocurrencies. We have all been talking about the adoption of crypto all over the world for a long time, and right now we can see the beginning of this process. This is just great news and we will probably see other large companies and funds start buying crypto, which will send the price of BTC and other cryptocurrencies to the moon. But no matter how it goes on, we always need to remember about the risks when investing and make our investments thoughtfully.