There’s a chance public/hotel/airplane WiFi will have what’s called a captive portal that will want you to agree to the terms and conditions or pay money to whoever owns the router. This is usually done by redirecting normal web traffic to a page with the tos, but if you’re not browsing the Internet and are instead, say, only using steam, it can cause issues. If that happens pop into desktop mode, open Firefox, go to any website and see if you get redirected to the hotel’s portal.

At least it used to be that you sometimes needed to open a browser. Maybe technology has advanced past that now days.