> most of them revolve around money laundering, drug trades, and ransomware.

You need a citation for that, because according to experts “In 2020, the illicit share of all cryptocurrency activity fell to just 0.34%,” reported Chainalysis [1].

For many, it's a hedge against inflation, for others it's the next potential global reserve currency, for some it's just a savings mechanism. There are more rational reasons than just crime that you're ignoring.

1: https://www.thomsonreuters.com/en-us/posts/investigation-fra...