> Then there’s the possibility they bought that company and killed it to stomp out completion and suppress the IP.
At their own expense, then, since they lacked a competing product. (And still do, and AFAICT, forever will, since I think this company has declared publicly they're out of that market.)
> other reasons
Yeah, sorry, none of these apply or make sense. Occam's Razor applies: it was a bad 9 figure mistake, that's all there is to it.