Getting users is going to be the hard part.

It is certainly a hard part, but delivering value to those users will be even harder.

Because delivering value will require an LLM with expertise on every place a person might want to travel and delivering useful answers to people with arbitrary tastes/desires/needs/itineraries/etc.

Some times for some people in some places "McDonalds" is just the right recommendation about where to eat. If you are at Exit 47 at 9pm it could be the best option. If you are in the French Quarter at 3pm, it probably isn't.

So how do you pay for good answers for everyplace in the world? Even Google struggles with that.