There are many mining pools who take fees from you for you desired Bitcoin addresses as they have more computing power dedicated to the network instead of individuals computing power
Those addresses are also risky to use, even if the mining pools are legit.
As they already have the private key they shared with you, your address is already considered exposed since day1.
And a hacker may intercept their message, or even hack their database.
So, the best would be to avoid those services at all costs.