about 2.3: if you provide a service to user to bridge "token" from eth to sidechain as anyTOKEN, **you have to 1) support liquidity and calc bridge rate appropriately 2) swap it using this liquidity for "token" in the same tx as bridging** otherwise it's s scam!

Real example, you advertize (eth)USDC -> (bsc)USDC with correct icons but instead multichain xyz gave me fake anyUSDC which has 0 liquidity on BSC! To, technically speaking, you rekt me.

Even if you fix it by writing all info that any USDC there in fact isn't real USDC, put instruction how to swap it to real one and even initialize liquidity providing - that's not users want. They want to bridge the asset from one chain to another in one click asap and cheap.