We also made it easier to try the product - https://territory.dev takes your right to the app and it's now possible to make a map without logging in. Working on making a comfy editor integration next.
We will be adding free notes soon. Arbitrary links and function calls is something I've been thinking about. We might do it if we find a good way. Yes, a completely free drawing board would be the extreme edge of the spectrum.
The back button seems to work fine for me, at least in Chrome. Could you provide more specific repro steps? Are you sure it's not just the OAuth redirect dance?
They are scrollable. We try to be smart with how we capture scroll/touchpad interactions for zoom/scroll so that they feel natural. Thanks for the feedback!