> The NN matches more users that all seem like they'd be likely to buy such a SaaS because it figured they're in the market, or have disposable income, or maybe

> The NN matches more users that all seem like they'd be likely to buy such a SaaS because it figured they're in the market, or have disposable income, or maybe have searched for productivity solutions, or maybe have browsed some competitors If the audience you provide has none of these attributes, there's no way for it to magically intuit that you want these things from your customers. The neutral net doesn't know what a to-do list is or who uses one. It doesn't know the price of your service. The only thing happening is it's determining which of the signals about the users in your source audience are the most impactful. By supplying the source audience, you're supplying criteria for who your ads should be shown to. Whether you're explicitly setting those things or not, you're still supplying criteria. You can't swap this system for a recommendation system, they don't work the same way at all.