There is e.g. https://www.ethicalads.io/ https://www.ethicalads.io/ which I have chosen to allow in my uBlock Origin settings, since their ads aren't too obtrus

There is e.g. https://www.ethicalads.io/ https://www.ethicalads.io/ which I have chosen to allow in my uBlock Origin settings, since their ads aren't too obtrusive and they (at least claim that they) only target ads using IP geolocation and site keywords. But I'm sure it's hard for them to grow their business, since most people in the target audience will probably be using an ad blocker in which they will have to make a specific exception.