[Rygian]

PII is never black or white. "_same_ person 104898" will become PII at any moment when the site can collate it on a one-to-one mapping with some other PII of yours (e.g. your email or login).

From GDPR Recital 30: "Natural persons may be associated with online identifiers provided by their devices, applications, tools and protocols, such as internet protocol addresses, cookie identifiers or other identifiers such as radio frequency identification tags. This may leave traces which, in particular when combined with unique identifiers and other information received by the servers, may be used to create profiles of the natural persons and identify them."

So your Apple ID becomes PII for a specific site at the precise instant you share any other PII to that site, that they are able to link to the Apple ID.