Marriott fined $600,000 by FCC for interfering with customer WiFi hotspots
Marriott (since 2012) has been using wireless technology to prevent guests at the Gaylord Opryland hotel and convention center from using their own Wi-Fi mobile hotspots, forcing exhibitors or customers to use Marriott's expensive Internet services, available at the whopping cost of $250 to $1,000 per wireless access point. Despite popular press reports, this did not involve "jamming" which is strictly illegal in the US, but instead something more like a WiFi DoS attack.
Marriott had deployed a Wi-Fi monitoring system with a "containment capability". When activated, the system could identify Wi-Fi access points that were not part of Marriott's own Wi-Fi system (or otherwise authorized by Marriott). Such non-Marriott access points were dubbed "rogues". When rogues were detected, the system sent "de-authorization" packets to the unauthorized access points, booting those users off their free connections and, presumably, forcing them to pony up for Marriott's paid Internet access.
http://www.commlawblog.com/2014/10/articles/enforcement-activities-fines-f/marriott-whacked-for-600000-for-war-on-rogue-wifi-hotspots/
Marriott had deployed a Wi-Fi monitoring system with a "containment capability". When activated, the system could identify Wi-Fi access points that were not part of Marriott's own Wi-Fi system (or otherwise authorized by Marriott). Such non-Marriott access points were dubbed "rogues". When rogues were detected, the system sent "de-authorization" packets to the unauthorized access points, booting those users off their free connections and, presumably, forcing them to pony up for Marriott's paid Internet access.
http://www.commlawblog.com/2014/10/articles/enforcement-activities-fines-f/marriott-whacked-for-600000-for-war-on-rogue-wifi-hotspots/
If that person had signed the agreement, they would then be liable under the agreement and could be penalized or sued or some other appropriate punishment. If the person had not signed the agreement (and keep in mind, they might not be the ones who made the travel arrangements and things would get trickier there - just because you authorize your travel agent to reserve a room for you does not mean you authorize them to sign legal agreements on your behalf), the Marriott could only evict them, and request police assistance if they refused to leave.
If the case went to court, the victim's contract lawyer would have a field day confirming whether or not the contract was actually valid - any number of factors could get it ruled invalid. If the victim was not the one who made the arrangements and did not authorize the signing; if the victim was in any way incapacitated; if the victim was presented with "oh, it's just a standard form, you have to sign it" talk by the clerk; if the Marriott failed to uphold its end of the contract in any way, including not providing the mandatory complimentary breakfast with hot oatmeal as specified in the contract; if the Marriott selectively enforced the rule (HE got away with it, why are you picking on ME?)... the list probably goes on quite a while, but IANAL.
The victim could then hit the hotel up for attorney's fees and infliction of emotional distress, and might do so anyway, regardless of whether they won or lost the suit, arguing that the agreement was egregious compared to the agreements other hotels force you to sign, and was deceptively pitched - and they very well might win. (It'd probably end up as a class action suit for all guests who had to sign the thing.) The lawyers would probably have a field day and everyone else would get shafted, as is usual for these things.
But, yeah, that would get rid of those "customer" critters Marriott would rather like to keep getting paid by, so you're right, it's only theoretical. Theory is fun!