

Generic in context.
Giving Tesla those trademarks would mean nobody else can call theirs using those terms. Giving both could mean they might argue the terms robocab and cybertaxi were too close and confusing too. But they are all terms we already use for that type of a vehicle.
We didn’t call operating systems windows before windows, and we (mostly) still don’t.
Also the trademark for X is like the trademark for Apple, very narrow in scope. You could start and trademark X as your own pretty much as long as it’s something that isn’t like Twitter.
And many already do exist (and did before musks X)
Russian sure is the more commonly known language than Ukrainian, but the russian invasion of Ukraine has lately boosted the idea that maybe we should start using the Ukranian transliterations instead, especially when talking about places and people from Ukraine - Kyiv/Kiev, Chornobyl/Chernobyl, Zeleskyy/Zelensky, and so on, instead of the way the russian say those names.