I've had my fair share of those (working for "moral" folk), also interspersed by (as long as possible) periods of trying to exclusively focus on my own open source projects, trying to create more meaningful work via those (in some sense not too dissimilar to your own, actually, just not as vocal about it... ;) Yet, I think for many the options between your (a) & (b) are becoming increasingly rare (IMO) and I wish it wasn't so...
What's missing here is also an option (c): leaving software/tech altogether (as livelihood)
