But in this forum and also in exchanges, I have seen where third party holds fund (escrow agents, exchange P2P). And the third party has 100% power to do anything with the fund. This is centralization and big trust on the third party.
Its because you have chosen to go through such, to start with, centralized exchanges are not compulsory for us to use, you can make use of a decentralized one, while the meaning of p2p is what does not require for kyc or any centralized authority for permission.
lastly, when it comes to the forum affairs and those who manage campaigns and hold funds, there is no any kyc information left on them from here, all you do is to make use of your bitcoin address for receiving payments, its now left for you to make use of a centralized exchange btc address or a non custodial wallet address, but there is no bridge at the cause of this, the forum make sure you have your privacy right from the point of your registration when joining, your email was not verified and no further personal information concerning you was required from you.
I read something called multi-signature escrow, which should be what Satoshi stood for. Why did we abandon the Satoshi idea of escrow?
Check the first comment for Satoshi idea of escrow.
You should have provided the link to that, using a multi-sig wallet is not by force, its a choice.
The Satoshi idea is using a Bitcoin wallet that requires multiple keys to release the funds.
Don't get the wrong idea behind using a multi-sig wallet from the concept behind Satoshi invention, here we may also require cosigners and not multiple keys as you said.