In general content promotion algorithms can't be regulated because a recommendation on which videos to watch is legally considered an opinion and thus Constitutionally protected free speech. The Supreme Court would probably only allow regulations in two narrow areas. The first would be where the promoted content is itself not Constitutionally protected due to obscenity or incitement of violence. The second would be commercial speech targeting children, who are legally considered as needing additional protection. For example the FTC can regulate some aspects of online services for minors under COPPA.

https://www.ftc.gov/tips-advice/business-center/privacy-and-...

Individuals can always control what they see by not using YouTube.