Mullvad also has DNS with different kind of blockers: https://mullvad.net/en/help/dns-over-https-and-dns-over-tls/ And for the DNS blocking you don't need an account.

I would recommend them too. No problems in more than 5 years.

Maybe Darktable is an option for you.

https://www.darktable.org/

I am using mailbox too and am very happy with them.

My main problem with the currently available apps is, that they all are quite laggy for me while scrolling. Jerboa, Thunder, Lift-off. Does anyone else have this problem?

You can long press on the Google keyboard, too. Maybe you have to enable it in the keyboard settings?