I honestly don't know how this isn't a thing. We force people to go through OAuth and add accounts to their discord, so that we can.... force people to go through OAuth to add their account to our bots... JUST so we can see their user ID.
For my example, I just want to know which steam account goes with which Discord account. I don't want to have to handle OAuth (or hassle the user for this information).
The biggest concern I have seen is "Oh, privacy!". We already have toggles for showing it on a profile. We already have toggles for showing it only to friends. It's honestly unreasonably difficult to make these integrations even after spending all this time and effort to make this platform so seamless. /rant