Unless people are ONLY going to use nostr to create little private silos (which is a perfectly fine limited use-case), I think "global" (public commons) nostr is going to have to move in the direction of clients only showing you content from people you specifically follow and then optionally (WOT-style) also people your follows follow.
If relays have to try to "block" stuff (as opposed to just not sending stuff that clients aren't specifically requesting), then: A. nostr won't be able to scale and B. nostr will eventually have to become twitter (or mastodon).
Nobody should be looking at so-called "global feeds" (except in private nostr-driven silos). The global feed of "global" (public commons) nostr is like a high-bandwidth fiber cable with TCP/IP traffic on the Internet. That's something that carries what you are interested in along with a vast sea of what should seem to you to be garbage you are not interested in. Why would anyone want to try to look at all that garbage?