There was another group a couple of years back that was similar. I think it was called bitconnect. They did bitcoin lending and other “investments”, as well as hosting a social media platform. I was in early, made a reasonable profit, then pulled everything out. They were later shut down and dissolved, I think by government action, but I’m not sure on that (it was more than a week ago and I’ve slept since then).

Bottom line, it might be safe to try with your spare change, pull out your initial investment as soon as you get ahead, then either stay in for another xx% growth and pull back to the sidelines or get out altogether. Even crooked hyips will be in for a good run, and if these folks are legit, you can rejoin later.