How do I block betrayal?

These dudes always appear out of nowhere, which is quite deadly on the EU server response time. I would like to block them.

I would also like to block Einhar because these mobs double-dip into gauntlet mods and archnemesis mods and are either too deadly or they're tediously tanky damage sponges and the rewards are tiny outside top tier maps.

I would also like to block Alva for similar reasons but not quite as desperate for that since I can skip it entirely. However, I can't see that option on atlas tree.

Can I block ghosts entirely? And rogue exiles?

You cannot block Ghosts, Rogues, or any of the core masters (Alvia, Jun, Einhar, Niko).

Pity, seems like an oversight. They're very niche and Betrayal is particularly deadly in gauntlet.

Fill up each faction hideout intelligence to 100% (but don't run it).
As long as a faction is at 100% they won't appear in maps.

No longer exists

GGG should get rid of the base chance for the masters already. It's a pain sometimes when Einhar beasts or Betrayal members randomly pop up in your maps (with potentially bad modifiers to potentially brick the map).