I bought 2.2 BTC back in 2012/2013 when they were around €60 apiece, and still had 1 BTC or so on the exchange (Bitcoin-24, the biggest in Europe at the time) when it was closed down by German and Polish authorities due to suspected money laundering. The owner of the exchange apparently tried to resolve things for a short time before going silent for the last few years despite his initial promises, seemingly f$$$ing off to Thailand and Cyprus and elsewhere with at least some of the profits and working on some other crypto projects - I seem to recall reading that there were about 18,000 BTC on the exchange at the time it went down, and I’ve spoken with a couple of people who lost a couple of hundred BTC. Still kicking myself from time to time…
Just out of curiosity, since you seem to be quite interested in crypto, are you familiar with the Bitcoin-24 story? I’m still a bit surprised that there wasn’t more publicity surrounding this exchange/guy.