I'm honestly surprised that WiFi Hotspot doesn't isolate hosts, after companies like Meta have been caught running servers inside their apps and connecting to those to track users.

I was too when due to network problems at our last traditional LAN-party (WC3, CS1.6 etc.) we used the hotspot feature of one phone to get everyone on a local network. I was skeptical and assumed the PCs wouldnt be able to see each other but lo and behold: it worked flawlessly!