The rclone utility is missing the protondrive remote. The remote is not listed when interactively creating a new remote and existing configurations using it do not function. The following command can be used to easily test if protondrive is available (it currently outputs nothing):
$ rclone config providers | grep protondrive
I am currently observing this bug using rclone version 1.67.0 on Fedora 41. I found another report of this same issue already occurring with 1.64.2 on Fedora 40. Running rclone selfupdate resolves the issue by upgrading to 1.68.2. According to the rclone developers, protondrive should be available as a remote since 1.64 beta.

Edit: I think the bug reporting form ate my link, here's the discussion about the Fedora 40 issue: https://forum.rclone.org/t/proton-drive-not-an-option-when-creating-a-new-remote/45963

Reproducible: Always

Steps to Reproduce:
$ if [ -z "$(rclone config providers | grep protondrive)" ] ; then echo "kaho is sad now"; else echo "Thank you!"; fi
Actual Results:  
kaho is sad now

Expected Results:  
Thank you!