Well if people are overwhelmingly choosing one chain over other for scams, speculations or money laundering, those are real use cases on my book, lol. Just because a use case is bad or illegal, doesn't negate the fact that it's a use case someone preferred Solana over some other chain. Also it's a myth that crypto is a common money laundering/scam apparatus:
https://www.coindesk.com/tech/2024/02/15/crypto-money-laundering-dropped-30-last-year-chainalysis-says/