it doesn't happen very often but there have been instances of decks that were masturbatory and/or abusive in their game length that got themselves ejected. Eggs is the most recent example. It was a combo deck in Modern notorious for impacting event length. Four Horseman is 100% masturbation and that deck was just plain ruled to not be playable in paper.
please don't compare nexus to four horsemen
also both the decks you named involve looping a combo which isn't absolutely guaranteed to advance the board state, so they aren't legit to loop