Oddly we get very, very few considering how many songs we’ve uploaded and how long we’ve been on SC. When the rare one appears I never bestitate to block them and report as spam. A quick process.
Is what you are posting mainstream market relevant anymore? You haven't played in what, decades?
Even
I get those scammers and my stuff isn't going to sell to anybody!
Biggest thing is to watch your play count. If your play count was 37 yesterday, and you hear from one of those parasites and your play count is still 37, they didn't even listen. They just "scam netted" you. And sadly I am sure somebody is dumb enough to fall for it. It costs them nothing to cut and paste their scam to every account on Soundcloud. Any fool that bites and sends them "promo money" is pure profit.
What would be fun to do as an experiment would be to create a bogus Soundcloud with a burner email address and put up the worst piece of garbage you can write, like a Bluegrass punk polka tune, and see if you get "That was the BEST thing I ever heard!!!!" type emails. In fact I might do that myself. Nobody writes bad songs better than I do!!!