Yeah I understand the mixers can still promote their projects through Google ads, social medias, someone else articles etc, but unfortunately I don't think they're legit. They're not like Bitcointalk when there's someone get scammed, people will know if the site is scam. They can use trustpilot or attacking their social medias, but I don't trust stranger.
If the site is using weird domain e.g. g00dmixer.com or greatmlxer.com, I know it must be phishing.
But if the domain looks legit enough e.g. goodmixer.com or greatmixer.com, I have no way to make sure it's legit or scam except they're a copycat.
There are few decentralized place such as Nostr. Although i've no idea how mixers should promote their service on such place while remain on-topic on place they visit.
Interesting, but I don't really sure if such place can be used to promote a project, not user friendly and much more like discussing a news. If I want to add, maybe Stacker News is another option.