Of course you can, both ways.
> On a private chat, Bob tells Alice how to send him fiat.
https://learn.robosats.com/docs/payment-methods/
> You can pay with any method that both you and your peer agree on. This includes the higher risk method such as PayPal, Venmo, and Cash apps.
C'mon, that's not trading fiat for crypto. That's "PayPal me some money".
Then it turns out that the promised future involves trusting someone to honour a paypal and pray you're not being scammed.
Whenever a big exchange fails, we see a lot of people say "of course, this is why decentralization is better." But I'm not convinced people are less likely to lose money in decentralized exchanges. It seems like it would actually be easier, it's just that a bunch of small scale scams aren't going to get the same attention as a huge exchange collapsing.
[1] https://bitcoinmagazine.com/business/robosats-private-bitcoi...
They're currently a little short on manpower. If you're a Java dev, you might consider giving a hand.
The last time I looked into this it needed a security deposit in BTC.
Tether's audit has been promised since 2016. Still hasn't happened yet.
Saying "centralised exchanges bad, DeFi good" misses the point that the main use case of centralised exchanges is not covered by DeFi.