I don't think it should be allowed. Users from RiD come over here and make loads of posts and then just continue to bash on NeXus bots. It's rather annoying to be honest seeing a new RiD thread every week.
Most of us already understand that RiD users 99.9% of the time don't get banned. We don't need a constant reminder each and every week by RiD members that their bot is sooooooo much superior to other bots.
This is not really a suggestion, because advertising is already against the rules. If you simply report the post then eventually mods will handle the advertising as they see fit. But other then that there is nothing that can be done.