I believe tuta might be the best easily available alternative (besides hosting your own)

your gaming account may be able to do some damage

I saw some weird routing from Open Street Maps and didn’t know why it was like that until I started using StreetComplete to help making the map better, I noticed some streets were marked as not paved (since they weren’t years ago) and the old data was still there, so the routing was trying to avoid those streets even if they were perfectly viable now. Updating that in StreetComplete fixed it.