Mike and everyone else who’s said similar things are 100% correct. We don’t need WotC to enjoy or play D&D. Doesn’t matter which edition. That’s the beauty of RPGs as a hobby, right? You buy the core book(s) and you never need anything else. Trick is, you don’t even need the core book(s). As Gary himself said years ago.
All it takes is a little elbow grease and some imagination to design your own stuff, reskin what’s already there, and run any RPG forever without a single (extra) dollar spent.
In the age of VTTs there’a trap in relying on the VTT to do all the math and programming the thing to roll the right dice with the right modifiers with a click of a button. Don’t fall into that trap and it won’t matter how unique, home brewed, or customized your game is. If that’s something you think you have to have, then you’ve chosen your own cage.
When I was running a VTT game I just trusted my players to not cheat. It's not like I'm looking over their shoulder at their dice or character sheet when we play in person. I even let people roll their dice if they wanted to, setting up a VTT to roll dice publicly is also pretty simple.