Disclaimer, I'm the founder of CodeFund.

CodeFund is what we consider "ethical" and different from Carbon Ads and other ad networks because (1) we do not allow 3rd party scripts, (2) no cookies accompany ads, (3) we are 100% open source (gitcoinco/code_fund_ads), (4) we only work with advertisers that provide relevant products and services that are good for the developer community, and (5) we literally do not store any private data, including IP addresses.

I recommend reading https://codefund.io/blog/countering-negative-press-how-ethic...