Dark web sites get busted because they paint a huge target on their back. They are usually running large scale drug and scam operations. This will surely draw attention from LE agencies and they might get hit with sophisticated correlation attacks to de-anonymize the operator's network traffic. This is extremely difficult to pull off and time consuming. I highly doubt the feds are doing this to everyone using TOR to browse .is, and I doubt they are building a profile on every single user of this forum. However, you might draw attention to yourself if you glow post or make some stupid threats.
Personally, I run a VPN with a kill switch at all times when I browse this forum. Btw Firefox (specifically Librewolf) mogs all Chrome-based browsers (like Brave) when it comes to privacy and fingerprint resistance.