Hey, we're building Ente[1] as an end-to-end encrypted alternative to Google Photos.
If it helps, Ente has been previously discussed on HN[2][3].
To answer your questions, we support imports from Google Takeout[4], and we stitch together metadata from their sidecar files to make your library whole.
We also support Family Plans[5] and have open source apps[6] for every platform.
Let me know if you have more questions, would be happy to help!
[1]: https://ente.io
[2]: https://news.ycombinator.com/item?id=39570692
[3]: https://news.ycombinator.com/item?id=28347439
[4]: https://help.ente.io/photos/migration/from-google-photos/