Bitcoin can be made illegal on a per country basis but a few countries have and are making it legal tender so it will continue to stay relevant in many places.

Bitcoin can be made illegal on a per country basis but a few countries have and are making it legal tender so it will continue to stay relevant in many places. El Salvador was first. Mexico is rumored to be looking at the possibility. It's too volatile now but nothing says it will always be. It makes sense for some countries where the local currency keeps on losing its value and dollars are hard to get. Even if it's made illegal all over the world the technology will continue to evolve and find its niche given the restrictions it might be under. It will probably take a few generations for it to happen. The idea of paper money took 100s of years to take hold so it's not out of the ordinary for cryptocurrency to take many more years to become common. Once Bitcoin became an asset, people's greed kept it going and will continue to keep it alive and evolving.