This dude seems confused about the core concept of protocols vs platforms. Sure we use "nostr" in conversation and this may contribute to the confusion but its a base layer with numerous apps cough clients built on its foundation.

Video - flare, zapstream

Photo - olas, blossom

Social - amethyst, primal, damus

Thats the entire beauty of it. Theres something for everyone and the ticket to get in are your keys