They are all crap stablecoin blockchains, but if you need to engage with them, then you are stuck using those that are the most popular among them. I have never used or heard anyone use USDT on Polygon or the BSC network.
I've used it on BSC.
Recently, I was somehow forced to use the BSC network, so it all ended with a conversion to a USDT(BEP20) token. Honestly, quite cheap transactions, with almost negligible fees. Around $0.04. After that, Ethereum and ERC20 are tough shit if you ask me.
So, it is probably the reserve will be zero in most cases.
It's almost like that now. Currently, most of the reserves are in BTC and ETH, with an insignificant share of XMR and stablecoins.
