While it is nice that you say you will eventually open source it, I'm concerned that there is a need for an account to use the free options. Most software could be used great without an account and collecting all of our private data.
Also, since we are forced to sign in, there is no option to use the website for auth and only Google or Github, both not the best choices.
Also, since we are forced to sign in, there is no option to use the website for auth and only Google or Github, both not the best choices.