Suggestion: https://wastef.money/#<post_id> for posts (# can be anything, like + or ~);
wasteof.money protip:
you can simply your profile links when sharing.
https://wasteof.money/users/jeffalo can also be sent as https://wasteof.money/jeffalo or https://wasteof.money/@jeffalo
Yeah personally I don't see the benefit - you might be better off aliasing posts to something like wasteof.money/p/:post_id