Gemini and Copilot are already full of ads, pushing the companies ' own services. I guess the only difference is here that OpenAI has nothing else to push, so they have to use external ads.

Haven’t seen any ads in them, though on paid versions

Do you have some source I could read on this? I don't really use Gemini but I would be interested to know more.

I've been using Gemini a couple months and haven't noticed it pushing Google products at all.

I did ask it some scientific questions about gemstones and it seemed to want me to buy sapphires, lol. Sorry, Google, that's outside my budget.