Doesn’t that say that Apple has to give you access to your photos in a format where you could then upload the photos/videos to Google? It doesn’t say that Apple has to perform the transfer for you. That’s the novelty here — Apple handling the transfer on their side without any user intervention.
Given the country list, this is being done to likely get ahead of some kind of regulation, but I don’t think this is necessarily due to this specific clause. This is above and beyond what would be minimally required.
But from other comments, it looks like this is the start of other data transfer initiatives between major tech companies. Which would be a good thing, even if it is a result of trying to avoid further regulation.
It wouldn't be under that specific clause, but GDPR gets attached to many situations because people don't have a clear understanding of what it is and the limitations. If you work for a global company you'll find GDPR attached all kinds of customer requests to get extra traction.
This is incorrect. The photos in Apple Photos and iCloud were already portable. Apple is now offering to do this for you which is the only notable thing about this. Nowhere in the GDPR does it say that a company has to move your data for you if requested. They just have to allow you to move it if you choose to do so and that was already the case.