4) Fundamentally, they're a fundamental primitive where users can collect assets together, with pool tokens acting as ownership of the pool.
Yield comes from airdrops into pools; AMMs are pools that trade on a DEX; baskets can rebalance on DEX markets; and more.
5) LQID is the governance token of Pools.
It governs fees from creations/redemptions among other things.
And 100% of LQID is governed by SRM token holders via EcoSerum. No presale/team/etc.
6) There are two ways to build Pools:
a) no admin key, can't rebalance
b) admin key, can rebalance
note that (b) requires trust!
I would also love it if someone built an on-chain program that could only trade on DEX markets so pool creators could use that as the key :)