I totally agree with this! I built a game and naively added ads to it as it seemed a good way to monetize. The game started to be really liked, and had 300k+ downloads overall. Many kids started playing it also. Luckily I realized quickly that kids play on the devices of parents and so the ads they might see are at times super inappropriate! Then I removed all ads, I'd rather make less money but have people play and…
I have my professional job developing software solutions for clients on a contractual base, but for a period after I graduated university I dabbled in mobile development and made the decision during that time that I'd never bloat my crappy apps with ads or tracking. I can't particularly articulate why I'm against that business method as a whole, but something always felt wrong in subjecting people to tracking/advertisements for my own monetary gain... if I'm not producing something worth paying outright for then I'm not going to skim pennies off the privacy of my users.