@woo Contributing to something unethical is unethical. Hitting your wife or your kids was the way things were done in the past, that doesn't mean it was ethical then and it isn't now. It has never been.
I don't think though we have to be very picky or strict with the past. I have written proprietary software and done all sort of unethical things. I just try to do better.
I don't think we should fall in the "it was normal back then" trap either.
Idk