I can't think of a greater incentive to only use open weight models than ads.
Disclaimer: I already use open weight models only since ~Jan this year and very happy about it.
Combined with the terrible system prompts that brick usefulness, increased restrictions from the US model makers, and Chinese equivalents that are actually decent
It’s simply rent seeking, and there is no moat
Imo the US model makers were doomed by the US ecosystem itself
Sam Altman having direct access to my chat messages is a close second.