I personally have no intention whatsoever of paying for a project designed for video commercial skipping in order to view source for automating a door lock. (I also have to question the oddness of requiring a paid donation to a site that has the following text on the very top of their webpage: "Project Hosting for OPEN SOURCE SOFTWARE." Since when does "open source" require a donation?)
However, if that's how @RBoy wants to "sell" his code, that's certainly his choice. If there are any licensing issues with it, I'm sure he's aware of them (or will eventually learn of them) and will handle them.
On the other hand, I suspect, that most people would be more inclined to give $5 to the author directly as a show of appreciation than to pay $30 to a website that has nothing whatsoever to do with SmartThings, door locks, etc.
...just my opinion.