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Interestingly, people consider USDT and BUSD and multiple other stablecoins as "crypto currency" for some reason, I do not think that they are crypto at all, they are a different breed and heavily centralized as well. The only exception for stability is those if you consider them as crypto currencies. In the long run we are talking about something like bitcoin then there is no stability at all.
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Yeah, you have a point since mostly they are not decentralized but the way they are made and working is can be recognized as cryptocurrency like first, a digital currency, using cryptography on the transactions, or how it is working.
But overall these stablecoins are pegged with particular currency, like for USDT/BUSD/USDC/etc are pegged by US Dollar to 1:1. Which are we gonna believe it is true as what entities are telling.
There are a lot of issues before about USDT that it is not 100% backed with USD, I am not sure as some people consider it also a FUD.