This made TF2 unplayable for me - I have a rare item (iPod earbuds) from the initial Mac launch, and the next few times I signed in I couldn’t get away from people spamming me to trade them.
This is one reason you wouldn’t be a crypto billionaire no matter how prices went up; you’d probably sell first.
That’s actually why email is centralized now. Gmail’s good spam filtering works because it can see what’s going to every account.
Some email providers (Hey in the US) don’t accept emails from other senders without prior authorization from the user. IIRC Chinese providers won’t accept any of yours unless you have a contract with them.