That tweet was in reference to "Wifi Enabled Garage Door Opener" support, which he did release. It's called MyQ. Tesla is just consuming they MyQ APIs and they don't control the cost of those. It's unfortunate, but MyQ is the only solution out there unless you build your own DIY solution.
As for buying any new hardware, I think all new garage openers from 2019 included MyQ, and for older ones that only supported the HomeLink solution, you do need to add MyQ. Since HomeLink is IP, it's not free (In 2013, Johnson Control sold to Gentex, I believe), and there has be no additional standard that I know of.
The Chamberlain group went ahead and purchased most if not all of the garage door competitors (LiftMaster, Raynor, Craftsman plus Clicker) so there is not much competition out there. I think it's either MyQ or you need to figure out your own DIY solution.
I think what everyone is interested in, if he plans to give all legacy Model S/X owners the same MyQ feature as he did with MCU/3 in some future 2023 release of the software. Can't be that difficult I believe.