Try installing an old version from the versions dropdown in F-Droid and see if the behavior still persists. If anything, this is a temporary solution at least.
As another user said, does the crash generate any reports that you can send along to devs? May be useful to get some actual data out there for them to look at if it is a genuine issue.
0.0.22 on LinageOS 18 (Android 11) with a previously configured slrpnk.net account.
Edit: I cleared all the app storage and cache, uninstalled and reinstalled, but still the same issue, immediate crash on start.
Try installing an old version from the versions dropdown in F-Droid and see if the behavior still persists. If anything, this is a temporary solution at least.
As another user said, does the crash generate any reports that you can send along to devs? May be useful to get some actual data out there for them to look at if it is a genuine issue.