Photos stored at High Quality before June 2021 are grandfathered in.

Enlarge/ Google is no longer offering unlimited photo storageexcept to Pixel users, that is.
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Today, Google Photos VP Shimrit Ben-Yair announced the end of Google Photos’ unlimited photo storage policy. The plan already came with significant caveatsunlimited storage was for the tier Google deems “High Quality,” which includes compressed media only, capped at 16 megapixels for photos and 1080p for videos. Uncompressed or higher-resolution photos and videos saved in original quality count against the 15GiB cap for the user’s Google Drive account.
As of June 2021, High Quality photos and videos will also begin counting against a user’s Google Drive storage capacity. That said, if you’ve already got a terabyte of High Quality photos and videos stored in Photos, don’t panicthe policy change affects new photos and videos created or stored after June 2021 only. Media that’s already saved to Google Photos is grandfathered in and will not be affected by the new policy change. Advertisement
Original Qualityagain, meaning either uncompressed or resolution over 16mp still / 1080p videois also unaffected, since those files were already subject to the user’s Google Drive quota. Any additional capacity purchased through Google One membership also applies to media storageif you lease 100GiB of capacity at Google One’s $2/month or $20/year plans, that capacity applies to your Google Photos data as well.
Finally, Pixel smartphone users also get an outHigh Quality media uploaded from Pixel phones, first through fifth generation, will continue to enjoy free unlimited storage even after June 2021.
Enlarge/ You might be bad at math, but Google isn’tthe company will look at the rate at which you accumulate data and project the point at which you’ll hit capacity limits.
If you’re not sure how long your available storage will last, you can get an estimate at https://photos.google.com/storage. That page will use the rate at which a Google account has stored dataincluding Drive, Gmail, and Photosand project the date at which that account will bump up against capacity limits.