Personally I'd limit access to all platforms that have algorithmic feeds that provide content.
If you need to specifically subscribe to a source (and parents can check your subscriptions via parental controls), it's fine.
And absolutely no posting any content for public consumption, for contacts only.
Example:
- Algorithm provides endless content with zero educational value (Youtube Shorts) - not ok
- Child needs to specifically subscribe to to a content creator (A Minecraft Youtuber, who isn't a shouty toxic merch pusher) - ok
- Child posts pictures of her things to contacts (friends, relatives) - ok
- Child posts content that can be viewed by anyone in the world - not ok