Also recently Atlassian released a Whiteboard (read Miro/infinite canvas) feature in Confluence cloud, so this could become another tool in the set that they release to keep people collaborating on their platform and not heading elsewhere.

No, I mean, desktop and mobile screen recording, in my opinion, seems to be simple enough even for laymen. I could also be convinced otherwise :)

As others have pointed out, it's not the recording that's the hard part per se; more so the entire workflow from hitting firing up the recording tool to getting the final recording -- possibly edited -- into the cloud for sharing in some seamless flow.

Lots of ancillary stuff involved. I know a team that went down this route and built a competing tool and the hardest part was working out the streaming upload and storage. Then you layer on things like permissions, lifecycle management, etc.

I have a lot of doubt Atlassian can build anything in a reasonable timeframe. CLOUD-6999.

Oh that's nothing. Check out CONFSERVER-5926. Create April 2006 and finally closed with resolution Duplicate(???) in 2019.