Some people think bitcoin is a bubble, for me it's not.

They just don't understand that what makes bitcoin unique from another type of investment is because bitcoin is decentralized and with a fixed supply.
Hence, the price is very volatile, and we know the reason behind, it's the manipulation by the whales but it will not make bitcoin worthless even if it will dump in the long run as we know bitcoin will recover as well.

Bitcoin is not similar to a Ponzi scheme, it's an investment that does not promise anything.