Why did rich men connected to crypto die?

I think that evil and rich people used the cryptocurrencies to launder money from illegal business. How else could they turn dirty money from the drug industry and the sex industry into clean money?

https://www.dailymail.co.uk/news/article-11480711/Russian-billionaire-53-killed-helicopter-crash-near-Monaco-latest-crypto-mystery-death.html?fbclid=IwAR0q1qiRPGA6Bv6M1BAEV4zzQBrlrK6v-83T3RofUz-6TiCPMttbWVDU6yw