the odds of, at a minimum, any given twitter profile being at least wildly off-brand for your namespace colliding persona are still very high. this looks like a legitimate edge case anxiety to me.
This isn’t that big of a deal at all.
Plus all you have to do is login once in a while to keep it active as far as Twitter is concerned. I think 6 months is way too aggressive though.
As for Twitter’s enforcement, it doesn’t shut down Elon Musk bitcoin scammers but it does shut down women complaining about the revolting DMs they get from men.
Sorry, but do you actually believe this? In my experience, nearly everyone who talks about their "personal brand" is some variation of a dull-as-dishwater marketing drone. Be a human, not a brand.
I believe it to the extent that if the person "cultivates" GitHub and GitLab profiles, presumably they at least have new releases of interesting features to announce, for whatever software they develop there.
EDIT: 1'. Twitter has rules and procedures against impersonation: https://help.twitter.com/forms/impersonation though I don't know how effective they are if you are not going by a real name but by an Internet handle that you claim is unique.
2. If you have such an important personal brand to protect, your Twitter account should not be in private mode. It should be public, with a public tweet explaining that you are really you but are choosing not to use Twitter, and where to find you instead.
3. If you have such an important personal brand to protect, you presumably have something interesting to say. Twitter is not a bad platform to say it.
All in all, if they take away your squatted Twitter handle, I wouldn't feel bad for you. Certainly not without a lot more information about why your brand is so special. And, well, if you can keep them from doing it by logging in once every six months, it seems that that is something you can shoulder to protect your brand.