[FabHK]

OP has explained that.

For Bitcoins, concerns about trust are warranted. Currency requires trust that it retains value; that is not given for Bitcoin and its countless clones at all.

Stablecoins collateralised by actual dollars quite obviously require trust, namely in the entity providing and holding the collateral.

Stablecoins collateralised by "the algorithm" have never been seriously tested, in my opinion, and it not clear to me at all whether you can manufacture stability algorithmically. DAI, SAI, MAI, whatever, are only collateralised by "assets" on the Ethereum blockchain, so ultimately self-referential (or, if collateralised by something tied to something real, require trust there.)