In the U.S., it's definitely illegal to listen in in any environment where there's an expectation of privacy. Disney recently argued that its TOS for a Disney Channel free trial subscription could be used to force the husband of a woman who died from anaphylactic shock after her allergy diet requirements were mocked and disregarded by staff at a Disney restaurant because he signed it and it included a forced arbitrat…
Note: article states the restaurant is not Disney affiliated. Disney claims this is the reason why they filed to dismiss.
https://disneyworld.disney.go.com/dining/disney-springs/ragl...
Disney's filing is available at https://cdn.arstechnica.net/wp-content/uploads/2024/08/2024-... - I trust that more than a PR flack's attempts to smooth things over.