You sound like someone i know xD

But I think gpl isn’t limited to software, or is it ? Anyhow, you have different varaites of Create Commons, depending on much limits you put, from 0(nothing) to 4(no commercial use, no remix etc.) they have license chooser on website here

They can put as much ads as they wan’t they will be blocked, and there always will be a way to block them.

Competition is useless, better to have federated networks and do videos for profit and find other ways to pay for content to support content creators if they need support. Block ads everywhere, work in those fields is better than calling for competition and creating competitor that will win over google and become new google.

There will be adblocker to block this also don’t worry.