They offer 5GB of storage in their free plan, which is enough for my use case of storing important files while my other files are backed up in my little self-hosted Nextcloud. (so should my Nextcloud instance go bad, my important files are still in the cloud!)
They are based in Norway, and importantly, they have a really easy to use Linux client, which you don’t often see with cloud storage providers. On Linux, you can use their simple CLI tool to select which folders to backup and everything is done in the background, it’s awesome! They also offer a Windows and macOS client as well if you stick with the corporate overlords (perhaps there is software that you need for professional workflows, idk), but I haven’t tested those out.
The main reason I like Jottacloud is because it has a good Linux client. I used to use pCloud (which also has EU based hosting) but it didn’t have a Linux client at the time. They do now, which is pretty neat!
My threat model is not super high (for cloud storage at least) since I just store my silly code projects and a few other bits in the cloud. It’s good to have options though, and for sure, E2E services will always be more secure and private. More options, the better!