How so?
BBRV had nothing to do with MOS until after Bill McEwen decided not to use it as OS4 on the advice of the proven liar Ben Hermans.
OK, you seem to be right and BBRV was only involved from 2001 on and I am projecting some of the behavior of Ralph Smidth & co. to Bill. Remember that before this OS4 vs MorphOS you also had other fights like PowerUp vs WarpOS where AFAICR Ben Hermans was not involved. These things play a role when deciding who you ask to develop software for you.
Each of the camps had their own personalities and the situation was like children blaming the other starting the fight. So painting Ben Hermans as the satan and not looking at the other side is doing history injustice.
Luckily most people have moved on. I don't see discussion in AROS world of how bad MOS or OS4 is. Nor do I see these post from OS4 people on MOS; the devs only comment on practical questions and don't react on these offensive comments anymore. Only in the MOS world there seem to be some die-hards who can't leave the past behind and try keep on stirring the pot.