The alternative is coinjoining. Coinjoin transactions are strictly superior to "mixing sites" since you can't get scammed out of your funds, and no third parties are trusted not to leak your privacy. The forum admin strongly recommends coinjoining over "mixing sites":
The scam comes from people with bad intentions, not from service, how they will do it is a completely different matter.
Wasn't there a case of scam by the Wasabi coordinator a few months ago?
Also, you are taking the administrator's statement from 5 years ago, various things happened in the meantime. So, for example, Wasabi no longer has the Coinjoin function, it also does an AML check, which can no longer be classified in the context of what the admin wrote.