Reddthat admin here, it’s mainly upto the moderators discretion to what happens with offtopic posts. But as we (I?) prioritise discussion over just a post, even comments like these are welcome. If a personal were to constantly post off topic comments or posts then we’d probably just delete them all and be on our day. There is nothing stopping people from posting to every community, but with enough eyes they get reported to us, then acted upon.