For a legit investment broker, even with an Uber-like disregard for regulations, 10% is too good to be true. Either it is far less than 10%, normal returns minus what their greed demands, or they aren't legit.

Possibilities include a Ponzi scheme or the like (possibly on the VC funding side), brazenly lying or carefully almost-lying to customers, delusional leadership, investments in something illegal or ridiculously high risk. Most likely, they care for their stock and their exits rather than their customers.