A lot of these are not scams! Over the last few years I've made in aggregate well into the 6 figures of side hustle advisory calls and engagements from these networks. Legit ones I've worked with include GLG, Guidepoint, Alphasights, Tegus and i'm probably forgetting a few more good ones.

Another interesting dynamic is that if you set your rate high, you might actually see more demand. Folks who use these services are not cost sensitive. They may often pick the most expensive expert in the hope of learning as much as they can in the fewest number of calls.

Just be smart though. Don't violate any of your current employment or confidentiality agreements when taking any of these engagements.