In my last game, I concentrated on optimising my defences for my home planet. I didn't take any other planet for about 5 or 6 hours, and then I couldn't take any because there were oceanfuls of hybrids in every direction.
120 planet map, diff 9 / 8.6. Both AIs have Hybrids.
Oh goodness, yea, that would be brutal. I forgot to mention that the "supply cap" is per-ai-player, by the way. Also, the difficulty multiplier is not per-player, it uses the higher of the two if there's a difference.
So 120 * 2 = 240 per player even aside from spawners (and diff 9 and 120 planets tend to have higher percentages of mkIV planets, iirc, so more spawners). Yea, they could have swarmed you but good
Typically playing against hybrids and not being aggressive early on is an excellent plan if you want to lose
But if you only turn hybrids on for one of the AI players and don't have as many planets, it's at least a little less insane. And diff 9 hybrids... that's pain.
And yes, hybrids are a little absurd, that's one of the reason's they're listed as an AI Plot (next to stuff like the Avenger) rather than a Minor Faction.