Apple: "We're shutting down My Photo Stream on July 26th and we won't sync your photos to other devices starting June 26th. We won't tell you about any alternative free methods on how to sync your photos or transfer them to your Mac so they can be backed up. No. We want you to subscribe to iClown Photos. You all know how unreliable our cloud syncing is but we don't care. We need more money to fuel Tim Cook's bonuses. You're welcome."
I used to use this before making the full move to iCloud Photos. I never had any issues with it, but it’s probably time to retire it: “Apple on Friday confirmed the My Photo Stream service will shut down on July 26, 2023. The company also announced that uploads using My Photo Stream will stop one month before, on June 26, 2023.”