Especially I think because of high demand, maybe request from the company or from individual.

I can't believe that people still ask this after Bitcoin has proven, time and time again, NOT to be a bubble!  

Bitcoin is here to stay, it is increasing worldwide adoption and has recovered from price drops many many times.

It's in great health and will continue to be healthy.

A bubble is something that is hiked artificially and does not have any practical base. However, Bitcoin not a bubble because we have some ideology and philosophy for it and it is very simple that to use the power of decentralization in order to deal with the issues of the centralised payment system. The user base was very small during the initial years but then it gained the price as per the increase in the user base so that is a key point in Bitcoin. The whole system relies on the decentralization and everyone trusts each other due to the clever code.

What do you think about this? In my opinion, bitcoin is not like a bubble. bitcoin is growing and it is used by many people, bitcoin is accepted by some countries.

No. Bitcoin is not in a bubble. It's value will only increase in the long term.

If bitcoin is a bubble till now than i am loving what bubble is! bubbles that make so many people millionaires not just in bitcoin holdings but, people are smarter now they just dont hold they do tradings and investment therefore if the investment is good you earn more and bitcoin is the base price of any altcoins on any exchangers except ethereum!