True, that's why context bidding I think will make it more valuable. There is also the concern that scammers might try to exploit this. There are solutions, but it's a complex problem to solve. One of the few things to solve for it is Bitcoin, and it requires an extraordinary amount of energy to do so. (of course, anything that claims to solve it without real-world costs is delusional)
Discussion
Yeah, it seems like one solution is to only show zapvertisments above certain amounts or choose whether or not to see them at all.