While I usually am fine with Ad blockers, Apple's position here is completely incoherent. They decided not to pay artists for a trial period, they've decided websites don't deserve to advertise. Why it's almost like the only way to deal with Apple users is to sell to them through Apple, and therefore give up at least 30%.
To be fair to Apple (or to be generous, depending on your point of view) the Safari Content Blocker isn't an ad blocker. It'll block anything you define in a JSON file. If that happens to be ads then so be it, but it could just as easily be malware, or images, or Javascript, or anything served by the government, and so on. If Content Blocker is Apple deciding that websites don't deserve to advertise then so are the developers of NoScript, ImageBlock, FlashBlock, GifBlock, CookieBlock, etc - but most people see those as privacy tools rather than anti-advertising tools.
Obviously people will use Content Blocker it to block adverts, but that doesn't necessarily mean it's Apple attacking the ad industry and Google. Remember that Apple own an ad network of their own, and this feature will hurt that too.