We have hosted thousands of virtual experiences through CFX and have not seen this happen, but completely understand your concern.
Our guests understand how each host works hard to create valuable experiences and that their contributions provide important income during these challenging times. For this reason we ask and remind them to NOT share an experience’s private link and that everyone who attends purchases their own spot.
For livestreams hosted on ChefsFeed this isn't a concern because we require viewers to be signed in and on the guestlist to access an experience. An exception is if the experience is public, meaning you don't require viewers to RSVP and be on the guest list to access the event. You can enable this under privacy options when creating an experience.