Admins have said “it doesn’t matter that much” and ignored the problem. Watch this space for citation
E: TheNewOrleans - Staff Report: Behavior involving Misconduct - NessiePendragon - #2 by forest2001
Essentially, any xeno can afk and just spam the evolve key because apparently not being able to build (not true since the drone Evo change) and choosing not to prepare the colony is not considered detrimental to the hive