Bad marketing can be annoying, but muting or blocking is usually the easiest way to deal with it. If someone's promotional content is flooding your feed, muting them can help declutter your space without completely cutting them off. Blocking is a bit more extreme, but it's an option if you don't want to see anything from that person at all.
Related note: I normally only mute scammers but I feel like we should all start mutating people who promote social credit scores and shadowbans on nostr. — nostr:npub1zede6daz3yp3qwhe45jqx67u2sns3qkqrtw4z4u3ljtxv9nultqs0e3hvt — nostr:note16q28e8yk5fyzc7kva7wna5dumftw3p2pj5h3lsqmstgczknf7r2sug2j4a