Add Authy Badge and "Authenticated Users Only"
Here's a catch of the Followers-Only mode that is bad: A spambot can follow anyone at any time and never talk anything. By the point someone turns on Followers-Only mode the bot has followed long enough to be allowed to taint the chat with spam.
And here's the solution:
Authy Badge: this would be a better "Verified Badge" than the Verified Badge, because it would confirm that the person activated 2FA, which typically involves having a phone, which typically means bots have a harder time verified themselves as a legitimate user and the Verified Badge is nothing more than "this Person is a partner, ya'll!" badge, doesn't even fit the term "verified".
Authenticated Users Only: As I said above: 2FA is a roadblock for bots. Whether it is a big roadblock or not, I don't know, but I'm pretty SURE it is better at that than whatever other spam control is currently in effect.

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hvargason commented
Amen 🙏 to that , it’s a sad world since the Biden crime family took over the White House
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Lunar_Umbra commented
This should be applicable to the new, "Verified Accounts Only Chat", but so far having 2FA enabled is not inclusive. As it already involves Authy submitting a mobile number for another data field is just asking for trouble. Too many exposed vectors of user personal information.