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Typical coffe-shop APs have disabled UDP all together, mostly because it is not needed for HTTP and "intended use" of a WiFi provided at a coffee shop.

I would say they disable it deliberately to prevent VPN tunneling, its probably a sane decision to disable anything not needed for the intended purpose (or not putting effort in enabling it).

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Actually my typical coffee shop does not constrain UDP in any way; otherwise DNS would break.

They are not sophisticated, they just do not want people leeching large amounts of data via the connection (which they basically perceive as http/1 or http/2).

Anyone using "something else" is basically noise.

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