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There have been a lot of times when I'm busy and doing something when some random person DMs me asking for some free stuff or bugging me to play a minigame. Maybe some sort of block system that would allow you to block DMs from players you put on the list
As Mallaidh above has stated, this has already been suggested and it's something we have on our to-do list to look into! Thank you for the suggestion though and we hope to hear more from you in the future.