I've bought a few online businesses; and when doing so - we of course transfer various online accounts. Once, I was given the primary Google account and as I w

I've bought a few online businesses; and when doing so - we of course transfer various online accounts. Once, I was given the primary Google account and as I was going through and updating security items on that account I discovered the previous owner had been using Google's password feature and I could login to a whole slew of his personal accounts (Not just the "Login with Google" ones). Of course, I just deleted all those - but the risk of centralization was certainly highlighted in that moment.