I have had the opposite experience. I have tried many different ad networks for my product and the only two that work are Google and Bing, but Bing has very low volume. Facebook's bounce rate is about 80%. I get billed for so many accidental clicks.

Most other non-faang ad networks are hot garbage. So many bots. In my view, Google has a "monopoly" not because of anti-competitive behaviour... It's because they have the best ad product.