My personal policy on something like Robinhood is it's OK if it's tied to my benefits, so 401(k) or RSUs; expecting to engage in benefits activity on a work device is reasonable. I also expect that any company spying into those apps/websites is overstepping bounds, though I'm not sure how this would hold up in court. Robinhood is also more a legal Bovada than Fidelity though, and of all apps, it's not especially pertinent.