It's perfectly okay that you choose your values that way but it sounds very judgemental to think that's the only way to live. I won't work in a place where I'm not at least proud of what I'm doing. If that's true then whether the company makes money from it is only peripheral to me doing more than what I'm paid for - I genuinely like and enjoy what I do, I like to code and often the most interesting coding problem before me (with the most resources at my disposal by a longshot) is my work related problems so I end up spending a good fraction of my time in weekends when I feel like u want to code, working on side projects that no one asked for but are within the company's domain. Simply because they're intresting to me and I become A better coder and learn new stuff. Also coding too is about practice. 10000 hours and all that jazz. I have become a better coder because of this. I probably won't do this forever but I'll learn and get better as much as possible from this time.

If you want to build a car from scratch in your weekend or just chill out, that's an equally meaningful and respectable endeavour as well.