What if aptos bridge is a bridge and also a dex

what if aptos bridge can be used as a dex and also as a bridge. we are all aware of what a bridge does. Aa bridge moves a token or altcoin from one chain to another right. What if the aptos bridge now has a dex that makes it possible to send eth from chain A to receive usdt on chain B. I cannot give details into the practical aspect because i dont’t really know much about it