That's true, but it's probably covered in the privacy notice. It doesn't make a difference that the data is shared outside of EU, it just has to be communicated

That's true, but it's probably covered in the privacy notice. It doesn't make a difference that the data is shared outside of EU, it just has to be communicated to the user. Also, the data shared here is not personal information, unless it's connected with personal information such as IP address or a tracking cookie. This is pretty gray area. Apple isn't necessarily sharing information with Google, it's just the property of Internet traffic that Google / Tencent can collect the IP address from the request. Same happens when websites include resources from other websites (images, scripts, etc.), and these are not typically taken into account in GDPR privacy notices.