This is my experience. They restrict or ban your account if you win too much in a short amount of time.

A retired friend does sports betting as a hobby and is quite good at it, but has been banned from two big name bookies for nothing more than a brief winning streak. No software or analysis, just a sports enthusiast.

I totally understand the mentality of folks who sell picks. Especially with all the KYC regulations these days it can be a real slog to keep an account live.