I think it’s perfectly possible to completely ditch X/Twitter. I used it for about 10 mins, years ago, and haven’t touched it since. It’s that easy for me. They’re completely blocked, at my browser, DNS, and router levels. In fact, looking at statistics, Twitter is nowhere near as big as the average Twitter user thinks it actually is.
As for companies presence on the platform, that’s kinda to be expected… or should I say WAS kinda expected prior to Musk. They’re on that platform for publicity reasons, to try and get to folks who’s yet to find out that Google Chrome is a bad idea.