My question is what's to stop Google or any competitor from using watermarks of Claude or OpenAI from degrading the rankings of sites that use it but ignore or

My question is what's to stop Google or any competitor from using watermarks of Claude or OpenAI from degrading the rankings of sites that use it but ignore or even reward sites that use Gemini. Seems like an easy thing to do for competitors, and maybe an unforeseen side effect of these types of things or regulations.