Let's say one or more of these coins went to Coinbase and the price jumped 10x-100x.
What's to stop the folks running StakeUnited from running off with the coins in the wallets?
Not saying they'll do this - just asking the important questions rather than jumping in blind.
When you are using an exchange, who hold private keys? them, not you..
I guess it's just the same concept, it's risky just as you keep coins on exchanges.
Be smart, don't put all of your coins there, test it and gain trust..
Crypto is a world of anonymity and success, any thing can happen but you can gain big $$ as well.
The point is that they take it for you because it's some times complex and expensive (you need hw to pay high electric bills etc), if you own the private keys means they can't stake it for you..