To be fair, the Jolla account and a Google account aren't really comparable by any means. Where Google has you provide the names, addresses and any other personal information of everyone up until your distant relatives (if they don't already have it), the Jolla account is just a username and a password. Would it be nice to download the applications on the Jolla store without an account? Sure, but having to come up with a new username is not really the end of the world. It's still possible to install new software through e.g. OpenRepos or just separate RPMs. Of course, this is also possible on Android, but it wouldn't surprise me if this possibility were to be taken away sometime in the future for 'security reasons'. It's also possible that Jolla is going to require more personal details for the account and remove the possibility of installing software outside of the Jolla store, but given their track record I really doubt that.

I don't know where the Ubuntu account fits on the spectrum, if it's also only user/pass or if you need to provide more details. User/pass is okay, anything more makes me wary.