How do i know what sites are allowed

Not any particular site but wondered if there was a list anywhere.

Remember a long while aliexpress was not allowed but is now.
Also get bombarded with Temu deals but presume this site banned as i cant see nothing.
Maybe there is a list of approved sites and i cant find it.

Or do you just post and if not approved it will be taken down (dont want to do this as it looks like you breaking rules.