Why won’t anyone build web3 gated communities?

Like a forum page where only holders of a specific NFT can get into, or perhaps an investment group where you need $100,000 in on chain assets to get access to?

Technically this is as simple as making a log in with Ethereum and call an API on the backend to zapper fi or something, so I wonder why it's so uncommon. 10 years of Ethereum, I'd have expected to find several "closed" communities around doing this.