But they never stopped work on Maemo?
And most of what they've used to build Maemo6+Meego-core Compatibility Layer does rely on OSS?
I'd argue the OSS community has benefited just as much, perhaps more, from collaboration w/Nokia.
What about all the open stuff they've improved & then dumped back out there, their closed stuff only constitutes a small % of the entire OS.

I think what you're talking about is being disillusioned with how things panned out with the N900?
I agree Nokia was quite deceptive there, many people had expectations it was going to be a "mainstream" smartphone experience (ala iOS/Android) + geek cred.
Nokia clearly didn't try too hard to communicate what the N900's purpose/emphasis was, TBH I don't think they really knew themselves.
They were somewhat schizophrenic...
Still trying to reconcile their partitioned product lines, & Symbian's place in all of that, & hence were tepid in their conviction about the N900.