https://wccftech.com/google-pixel-4-users-wont-get-unlimited-photo-uploads-at-original-quality/

Pixels have always had amazing cameras. A part of the camera experience involves saving the image in its original form, not to lose quality, which is why Pixel users were entitled to unlimited photo storage on Google Photos without the usual compression shenanigans. This was true for all three Pixels, and it appears that Google is pulling the plug on that program starting with the Pixel 4. We can say for certain as it was advertised with all previous releases, but the Pixel 4 listing on Google's website has no mention of it.

The only other Pixel device that didn't come with free, unlimited Google Photos storage was the Pixel 3A. Then again, those devices cost less than half of what the Pixel 4 does, so it was understandable. The Google Pixel 4 starts at $799, and the XL version is $899, which is not cheap.