> Considering Bitcoin had never fallen lower than a previous cycles ATH (All Time High) until now, who is thinking that this might be a sign of the end of crypto?

This sounds like just another one of those synthetic signposts people create around crypto. It's just a pattern. It has no particular significance; beyond the fact that if enough people believe in it, then it might influence their actions in a way that moves the market.

My favourite was that people were going around saying the cost of mining Bitcoin served as a floor to the market. As though the miners would (somehow) stop the price going down when it became unprofitable for them to mine. More likely, they'd just stop their mining activities and move onto something more lucrative.