that's an interesting development for sure. just recently I've been actually trying to find some information on whether or nor there are some blockchain based advertising services. perhaps this just a beginning...
although they also use FB apparently - so, it's not exactly their own network. but anyway... I guess at present moment no any Crypto can accomplish such a task of sort of creating "unified" (i.e. linked to all blockchains) network for running Ads... besides, even such appears - who and how and WHY would bother to view anything on it - if there are already FB, YT, Google, etc. so. perhaps now they have no choice but use those mainstream corporate giants to at very least get their own "slice of cake" :D