A somewhat flawed solution to a harassment campaign is whitelists.
This is also the approach celebrities in general need to take as they get drowned in messages (elon musk could spend 24/7 reading messages sent to him and read only a tiny fraction), so harassment can probably be solved by whatever solution we come up with for celebs.
Can make some fairly elaborate "allow" rules depending on why you might want to read messages from non-contacts like "this person is a contact of a contact" or "this person has "IT" in their Twitter bio or "this person is on the 'good person' white list that Mr. Whitelist maintains for the community".
This is also the approach celebrities in general need to take as they get drowned in messages (elon musk could spend 24/7 reading messages sent to him and read only a tiny fraction), so harassment can probably be solved by whatever solution we come up with for celebs.
Can make some fairly elaborate "allow" rules depending on why you might want to read messages from non-contacts like "this person is a contact of a contact" or "this person has "IT" in their Twitter bio or "this person is on the 'good person' white list that Mr. Whitelist maintains for the community".