My kid is 10 and still doesn't know a single Youtuber by name and doesn't really watch Youtube. We did try Youtube Kids at one point, but it was just 99% toy ads masquerading as authentic content.
Netflix has a pretty good age limiter and well produced TV-shows. Disney+ has Bluey and a ton of other content. AppleTV+ has a few good ones too, but not as much as the two big ones.
Paying the few coins for a streaming service w/ age limits is highly preferable to risking your kid ending up on some Elsagate[0] video because of the algorithm. Or ending up in a parasocial relationship to some screaming jumpcutting Youtuber who shills their merch on literal children.