Completely unjustifiable to complain about something FREE AND OPEN SOURCE
The developer owes nothing to anyone and is CERTAINLY not owed backlash for using the tools available to try and continue to help others
This kind of reaction is how to ensure the death of FOSS projects. It’s bullying, it’s insensitive, and worst of all it helps no one.
I recommend demonstrating your values with helpful actions like donating to FOSS projects, forking them, etc
The lack of control and sustainability you’re articulating represents one side of the basic nature of FOSS.
There are no shareholders.
The other side of it is that it’s open source - someone else can pick up from here and do it their way and there’s nothing stopping them or you.
There’s no good reason to go after the developer.