I got no idea about Haveno. But I can highly recommend you to use Bisq instead.

Bisq is 100% on Tor, you only trade P2P, but you need at least some bitcoin to start trading, even monero, like 0.02 btc. Because the security fund can only be through BTC.

If you try to scam someone and you failed the dispute, you lose your security fund, it is something like 20% transaction fund. So there aren't any scammer there,  at least I never meet one and I already made more than 20 transactions there.

Starting the application may sometimes be problematic (many bugs or tor attack which prevent the app to launch properly), but if you run a full bitcoin node on your computer, there won't be any more problems at startup.