Thinking of it, the discussed do-it-yourself update checking is so stupid that malice and/or other serious bugs should be assumed.
Going back to the blog post and re-reading it with this possibility in mind is quite a trip.
> It turns out thousands of our users had the app running in the background, even though they were not using it or checking it for weeks (!). It meant thousands of users had auto-updater constantly running and downloading the new version file (250MB) over and over again every 5 minutes
This could easily have been data exfiltration from client computers instead, and few (besides the guy whose internet contract got cancelled for heavy traffic) would have noticed.
Screen Studio has 32k followers, lets say 6% are end users, 2000 users at $229, that is $137k in App Store fees.
I am going to say writing your own app update script is a wash time wise, as getting your app published is not trivial, especially for an app that requires as many permissions as screen studio.