I wonder if this concern could be partly alleviated through a price lock-in strategy. There could be a contract that says because the subscriber has paid for N months, that subscriber is eligible to keep paying the same price for 5-10 years, regardless of the price for other subscribers. This could incentivize people to start their subscription early.
Makes sense. Still, I've been burned a bit when Microsoft surprisingly abandoned a developer tool I purchased. Flagship or not, a lot can change in a few years.
https://en.wikipedia.org/wiki/Category:Discontinued_Microsof...
Was this tool superseded by Visual Studio ?
From what I can tell they went from having a dozen small dev tools into consolidating everything in VS Studio.
This has also been somewhat mitigated by VS Code, not everyone needs a giant 30GB ide to edit text. I think Microsoft is one of the better companies when it comes to developers. You don't even need Windows to compile Windows software... Unlike Apple that locks everything behind over priced hardware.
That wouldn't stop the developer from abandoning the project though. I don't like using closed source tools when I can avoid it. Visual studio is a big exception because Microsoft will never abandon it in a million years, it's literally their flagship IDE.
The same argument can be made for the jet brains IDEs. But a closed source tool made by a solo developer just seems too risky for me, even if the OP was giving it away I'd be a little bit reluctant to use it.