https://wccftech.com/future-pixel-phones-could-feature-unlimited-google-photos-backup-with-a-storage-saver-option/

One of the biggest benefits of having a Pixel phone used to be that Google Photos would allow unlimited storage for high-quality photos. However, that feature is being stripped away starting next month. This means that all the photos that you will upload to Google Photos after June 1, 2021, regardless of whether they are original quality, high quality, or express quality, will be counted towards your 15GB limit that is allotted to your Google Account. If you do run out of that limit, you will have to pay for Google One subscription.

Thankfully, Google is not taking away this feature from the current lineup of Pixel phones, as they are allowed to keep receiving high-quality uploads for life. There were reports that Google does not plan to offer the same feature to the future Pixel phones, but it now seems that Google might have something else in store for the Pixel devices that will be launching in the future.