This looks like a very interesting alternative to rollups, from what I understand they've received quite a lot of funding from Web3 foundation as a grand and they're now looking to publish the SDK for the community to use, I can see a lot of benefit to this.

Smart team, looking for more cost/benefit for Polkadot, given the amount of $

I do think the ask is high, but enabling to interact with a group in a secure environemnt is something that can be used through the ecosystem. still some hurdles that they need to go through on the estate channel front.

it's the right idea but too expensive