I think there are qualitative differences between the bans you mention.

Banning "creepy communities" and conspiracy subreddits on Reddit was about trying to make Reddit less of a haven for people who congregate to validate each other's potentially-dangerous ideas.

Banning Trump from Twitter was a straightforward matter of him serially breaking the rules.

Banning Substack links from Twitter is very clearly an attempt to harm a competitor, with no upside for users.

Trying to claim that the latter will be seen in the same light as the former two after some time has passed doesn't seem to follow logically.