@pomstan @PhenomX6 @alex @gnusocialjp @xianc78 Actually, we technically already have such containment boards.
For example, Mastodong.soycial and Disqordia for the authoritarian left, Gab and Poast for the authoritarian right, 076 SNS, Baraag, Pawoo, and Game Liberty for libertarians.
The auth-left ones niggerlists all the instances that don't align with their political believes the auth-right ones either niggerlists all instances that don't align with their political believes or don't federate at all to begin with, and the libertarian ones (I mean the real ones, not those that claim to be such, and then maintain a 900 zillion pixel high niggerlist) don't block anyone (or just a few because of spam or bots), and in many cases have an "each user decides for him or herself individually who they want to follow or not" policy.