If ChatGPT shows ads, I'll switch to Claude or Gemini or DeepSeek.
Everything else aside, it's simply not worth it for them to try to skirt these rules because the majority of their users (or Google's) simply don't care if something is paid placement or not, provided it meets their needs.
In other words, if they want to put ads into chat, they just need to be perceived as well aligned to Trump to avoid any actual punishment.