This is an awesome idea! And the multiple levels of abstraction enrich the concept.
What would be the pricing model?
I also want to give two shout-outs: - the Echoes Chrome Extension that makes it easy to search through conversations: https://echoes.r2bits.com/ - and Tana, of which the supertags reminds me a bit of your user-defined datatype: https://tana.inc/docs/supertags
Thanks for the pointers. The pricing is free for now. In the future we’re guessing it will be a typical freemium pricing model. There is also a totally self-hosted version that people can license.