Users should understand that when security matters trustwallet is not an option to fall on as a user keys stands a chance of being at risk of exposure.
There are better wallets for bitcoin than Trust Wallet, there is no doubt about that. But those playing around with altcoins and shitcoins don't have that many alternatives. That's why Trust Wallet, Coinomi, and similar clients are so popular and often recommended.
Bitcoin is decentralized, censorship-resistant, and open source. On top of that, you have wallets that operate in the same way.
But if you are holding an altcoin on a centralized blockchain that can be censored and frozen by the issuer (like 99% of stablecoins), you have a problem on a protocol level. You can use an open-source wallet to store your keys, but your address and the coins on it can still be frozen by the issuer and on the request of a 3rd-party. It didn't really help that you were using a non-custodial and open-source wallet when you still got locked out.