Is there a platform like Mirror/Paragraph, but instead of "collect," people can "sign" (as in, a manifesto)?

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The first time I saw this was on pluriverse.world and thought it was a great idea. I haven’t come across a platform with the feature, but it’s worth considering for your own website until the platform exists.

Yes!!! But not a separate platform. Keep all content in one place.

cma.xyz. Founder /paragraph, ceo /mirror, previously at Google & Coinbase 

I was thinking that "collect" is passive and "sign" is a more active sentiment.

One example:
1) Sign a manifesto (or community values).
2) Get airdropped a token or allowlisted.
3) Token unlocks access to future content.
4) Track what you've signed (like collected).

Interesting. What's the motivation? Gathering on-chain support around something?