Can ERC-20 based stablecoins be confiscated or blacklisted? Can I lose my stablecoins? What are differences between stablecoins out there?
Technically ERC-20 standard itself cares about transfers and transfers only. It does not care what happens outside transfers and this activity might including thing like minting, but also things like freezing, blacklisting or reclaiming tokens.
The censorship resistance of a particular token has more dealing with the issuance of the asset the token presents. Then this derives the characteristics of a smart contract. Generally, stablecoins can be divided into two categories.
Synthetic, cryptocurrency backed: DAI, sUSD
US dollar bank account backed: USDC (recently had its historical first blacklisting), USDT
US dollar bank account backed currencies are subject to the US law. Thus, they must have a way to have legal enforcing. In the case of USDC a court order was served to the Centri, the company managing the reserves of USDC stablecoin. Centri needs to follow the court ruling, or they cannot keep existing as an American company.
On the other end of a spectrum, we have MakerDAO DAI that was backed purely by censorship-resistant cryptocurrencies (USDC was included in the collateral pool causing this principle to break). If the collateral for a stablecoin lives on a blockchain and is censorship-free, it is harder to have a court oversight to stop something in this kind of an ecosystem, though not impossible as the court could always go after well-known DAI or collateral holders.