-I don't know of any "third world" country where someone can use USDT or USDC in many convenience stores. Therefore, I don't consider the kind of onboarding happening right now as beneficial to these countries.
-I dislike the term stablecoin because fiat has no stability other than ennui, preventing more rapid price changes. the notion of creating a decentralized digital asset which mimics the purchasing power of a dollar fails to account into its tokenomics what a dollar even means. More specifically, the stablecoin concept suffers at least one extremely flawed quality: to maintain a 1-to-1 peg between the number of dollars accounted for in a company's assets and the number of stablecoin units minted, the minter must either charge a fee, or try to earn money on the "assets" which necessarily comes with risk in the underlying instrument. Without resolving this issue, stablecoins serve as little more than a bank, whereas many of us support bitcoin because WE FUCKING HATE BANKS.
Bitcoin doesn't need FIAT currency on it. Yes, people will implement fiat currencies and violently enforce some public acceptance of a peg to bitcoin, but FIAT = FIAT. Not your keys, not your coins. I think we all do well to steer clear of all that horrible crap. Bitcoin needs its own price discovery. FIAT currencies necessarily muddy the waters, and warp value because some people literally get it cheaper than others.
NO FIAT ON BITCOIN!!