The OpenBeOS project got a Cease and Desist request from Palm, back then, and this is why they decided to change their name. Maybe they could have argued that there was no problem.
For similar reasons, the french company Free threatened various other companies, for example Free Electrons which renamed themselves to Bootlin. Maybe they could have gone to court, but they didn’t want to waste efforts, time and money on that.
Anyways, it’s been almost 20 years, few people remember BeOS, the Haiku brand is getting some recognition, and it’s time to move forward.
There will always be a small number of people still dreaming about BeOS, exactly like you can find some dreaming about Windows 3.11 or 95. A time where things were simple, fast, and would bluescreen or suddenly refuse to boot or open a Terminal for no obvious reasons, and all you could do was reinstall everything.