so you want a service that does everything, is around forever, extremely reliable, affordable, and easy to use, and not affiliated with big tech? and you don't want to do anything yourself?
The Nextcloud app on my phone automatically backs up my pictures to my Nextcloud instance. This is painless to run in a Docker container at home, but Nextcloud also has a subscription service if you don't want to self-host, and your money funds free software.
I self-host Immich on a personal home server. I do pay for backups, though. For 65GB of images (not a lot) I pay ~$1/mo to Backblaze. The backed-up data is 30% bigger in size right now (= 82GB), as it's incremental.