Blitz spawn camp cheese

Experienced a new strategy today in blitz that breaks the game. In 3v3, have each team go to a different zone, if the enemy doesn’t go to all 3 zones, have the 1 person at a zone with no opposition head to the enemy’s spawn area. If your teammates are able to kill off all enemy units and your army is large enough in the spawn area, the enemy will have no vision on the map and will only be able to spawn in their starting area, except they will immediately be destroyed by the large opposing army who have setup there. The enemy will be powerless at this point as the unbalance will only get bigger with time.
One solution, don’t allow enemy troops to enter the opposite sides spawn area. Curious if anyone else has seen this in their games. Just lost 3 games in a row to this issue.