The good news is that this should definitely reduce the volume of bot / troll accounts, by making it prohibitively expensive to run. That will mean a reduction of disinformation on aggregate - as what other purpose would there be to run a bot network?
The bad news is that it recreates the lords vs servants dynamic that Musk is claiming to want to get rid of. $8 is not much for everyone reading on HN, but guess what, we are very much the in the globally privileged 1%. He later adds something about purchasing power equivalent, but localised pricing suddenly makes this into a much bigger technical challenge