I'm fine with Marriott using deauth jamming against [...] or operating on their specific wifi channel
While they might have a justification that a "Mariott Wifi" ESSID on a Mariott hotel is theirs, how can they say a specific wifi channel is "theirs"? Wifi runs in unlicensed bands, any device which meets certain technical requirements is allowed on any channel in these bands, no matter who the device owner is. The 802.11 protocol is designed to share wireless channels between APs with different owners (while it also assumes that APs with the same ESSID have the same owner).
And what would be "their" channel? A well-designed wireless network for a large enough area will use several channels. Unless they have a single AP (unlikely) or their network is not well designed, they are probably using all the non-overlapping channels in the 2.4 GHz band and many channels in the 5 GHz band, including all the non-DFS ones.
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While they might have a justification that a "Mariott Wifi" ESSID on a Mariott hotel is theirs, how can they say a specific wifi channel is "theirs"? Wifi runs in unlicensed bands, any device which meets certain technical requirements is allowed on any channel in these bands, no matter who the device owner is. The 802.11 protocol is designed to share wireless channels between APs with different owners (while it also assumes that APs with the same ESSID have the same owner).
And what would be "their" channel? A well-designed wireless network for a large enough area will use several channels. Unless they have a single AP (unlikely) or their network is not well designed, they are probably using all the non-overlapping channels in the 2.4 GHz band and many channels in the 5 GHz band, including all the non-DFS ones.