I looked through the standard 'alternative to Google photos' top 10 lists that get updated occasionally and none of them offered a similar enough experience to make me look deeper.

I saw ente on a Reddit post somewhere. I like it's a mostly paid product with what seems to be a sustainable free/trial tier which is unlikely to drive them out of business. I like the e2ee, and their clients being opensource and they provide an easy way to keep an offline mirror (through the desktop client). It ticks my boxes.