In my take a look at Cardano did not do any swaps for me.
Telos has by no means failed.
ADA gave me 0% transactions that went by
TLOS gave me 100% tx that went by
That is the place I discovered Cardano testnet app- https://app.minswap.org/
Telos testnet: https://demo.telos.finance/
cardano testnet fail
ada testnet fail
ada testnet demo
cardano testnet demo