That's weird. Since it defeats the purpose of expanding their WiFi hotspots coverage. If people have capped plans, they are likely to disable that hotspot altogether and use their own routers to begin with, to avoid anyone switching it back on. If they wanted such thing to work, it had to be excluded from both monthly data caps and active bandwidth limit.

That's besides the point that monthly caps is a completely nasty rip off. Luckily I never had one. Are they common in Comcast network?