It’s been used successfully as a form of mixer for Bitcoin, I.e. swap to Monero, then swap back. I suspect this use case will drastically increase in popularity now.
Maybe, maybe not. We have enough decentralized coinjoin protocols for bitcoin out there.
What? The only major CJ protocol left out there now is JoinMarket and that is not as nearly user friendly as Samourai or Wasabi. JM is nowhere as good as Whirlpool either. It had 100% entropy with perfectly uniform amounts.
Unless you space out transactions randomly, this actually does not help very much.
I assume people wouldn’t swap back the same amount in a single transaction. Especially shortly after swapping to Monero. Is this what you’re referring to?
If you swap a very similar amount and or swap amounts really quickly from say Bitcoin into Monero and then back to Bitcoin within a short amount of time, it's easy to figure that out.