I don't think it is true to say "Most" other car makers do OTA updates. Yes Tesla lead the way on this but Tesla built thir system to do OTA updates ground up from day one. Most other carmakers are legacy carmakers and have a vested interest in keeping work flowing through thei workshops. The push is going to come from new entrants into the market and start-ups (particularly from China) who havent a legacy dealer network in place throughout the territory and they will build in OTA updates as an important feature of their offering to give early adoptors of these new unfamilier car brands confidence to buy knowing there is a means of supporting them and their new EV.
Xpeng does it, Polestar does it, Volvo does it, GM does it and even VW which is the embodiment of legacy car makers seems to have OTA updates.
And even more brands like Audi, BMW, Honda, Hyundai, Jaguar, Mercedes, Nissan, Stellantis (Vauxhall, Peugeot, Cooper, Jeep etc.) and Toyota seems to be doing at least Infotainment updates.
The car makers have an interest in getting their cars through the workshop yes, but they just find new ways of doing it....Like MG, that has "Brake fluid change" every 2 years, which is very excessive, but when they can't do oil changes and so on, they just change brake fluid instead, even though it's really not needed that often.