I find it weird when I see free stable coins transfer on any chain, it's rare for these chains to see revenue and then ignore it. One way or the other, they make fees.
I'm not sure if there is any network that will sustain free stable coin transaction for long time
Tether itself earns billions of dollars per year from the government bonds they bought with their users' money. I don't use stable coins, but I would have expected very cheap or even free transactions on some chains just to promote their usage.
But why is that? Most USDT are on Tron blockchain and followed by Ethereum blockchain. If you see some other blockchains and later 2 like BSC, optimism, and especially those like Aptos that the fee is almost $0 like someone is not paying any fee, people do not use them up to Tron and Ethereum blockchain if it is USDT.
Tether is the winning bank here, they claimed USDT is backed by fiat, bonds and treasury bills. Part of this funds are kept by government as bond and treasury bills for some duration and in return they get interest. These bonds are totally safe and are risk free, the interest alone covers company revenue generated.
The chains usage doesn't generate revenue to Tether directly, it gives more impact to the networks, the more transactions of USDT on Tron, Ethereum and other chains, the more transaction fees are burn and more validators makes money from the chain, the more the network becomes busy, Tether get to mint more USDT, money will be flowing to the company, this makes more sense when Tether burn USDT on one chain and mint new on another chain due to demands.
The free transaction on Aptos is a promotion, they don't have much user exposure like Tron, Ethereum and the rest. If you look back, Tether has discontinue it's service from some chains due to low demand, I did move USDT through Algorand one time but now it's no longer there. If Aptos doesn't have much exposure, Tether may cease service from there too unless there is some kind of special partnership between Aptos and Tether.
