But I pay for AT&T service and as part of that service they claim access to free wi-fi hotspots of theirs. I think this means that I PAY for these hotspots. So having advertisements in a paid service is obscene (well, more obscene than general purpose advertising). They don't need this side income from their paying customers.
Yeah. Like their ad-free U-verse service. Oh no... wait. Look, advertising isn't the problem. A pre-roll add, or whatever wouldn't be offensive (just annoying). But injecting code into other people's sites. Yeah... not good.