We know, you have millions of clients and 95% of them, as you know too well, want to be able to accept or decline friendlies.
What's the purpose? No one has the right to do anything right away with anyone without the other's consent and awareness. No one.
You know the broad audience of this game, how many kids play this and the implications of such incorrect concepts you are in a way teaching to them.
In your logic, there's no problem if someone is unwilling to be abused no matter what damage it may cause, but it's a problem if, in your own words, the abuser has "other important matches by then" and abusing isn't convenient anymore.
We know.