Thinking about this analogy further, where captive restaurants do exist their prices probably meet the definition of enshittified. Cruise ships, movie theaters, stadiums, concerts, etc.
It's not like by adding a moniker on this phenomenon ("enshittification") or by upvoting or downvoting arguments we agree with that we can change the phenomenon anyway; pricing and economics are a distributed exercise.
And with you there, it's already starting to sound like a buzzword to me. The first step on the road to losing all meaning.