Are you kidding me? Tow banners, traffic watch, ariel photo's? Well you called those jobs actually what they are, mere time building. Time that goes only to filling out boxes in a log book to meet some regional airlines mins. Doing those jobs builds absolutely NO airline experience. So what if someone's dad had their own airplane, a beech duchess lets say, and they droned around in VMC, daytime for hours and hours. Pretty much all 3 of those jobs you mentioned accomplish no more than that. Also, airnet doesn't even have any turbine equipment they use in that program anyway do they? You're not actually comparing a Cherokee or something, to a Metro are you? Would you criticize that person who built his time in a family owned Duchess? I'll take the pilot that flew turbine equipment as SIC for a reputable 135 carrier who has already had a taste of airline training, and actual line operations any day over someone droning around in a GA aircraft. Am I saying those 3 jobs you mentioned are invalid? No! I'm saying there are other ways where you can build experience in addition to mere flight time.
So how about you not pissing on other people because you don't like the way they built some of their experience. Sitting in a seat that is going to go up empty anyway is no harm no foul to anybody. No where in that are you lowering the bar for airline pilots nationwide. Republic pilots flying 90 seaters for 50 seat pay is another matter. All these mainline guys that went to Continental Express, Business Express, and the litany of other regional airlines back in the day is also another matter.