Would be really neat to put Drawpile on the Fluid Framework. You could easily map Drawpile's ordered operations into distributed data structures. I did a similar thing a few months ago with QuillJS's operations and it worked great!
The main advantage of that integration would be a ready made Azure service + future integration with Microsoft Office.
(I used to work on the Fluid Framework)
Only one small past related thread:
Drawpile is a free software collaborative drawing program - https://news.ycombinator.com/item?id=17141368 - May 2018 (4 comments)
Interesting that there isn't any mention or use of CRDTs, that would have been the first thing to see from this document.
Nevertheless, it is still refreshing to see a different way of doing things like collaborative drawing without them.
Curious to know of this design decision.