It’s a normal part of the game. You need to accept the employer and employer needs to accept you.

It’s nicer to call them hey, I’m going to cancel as I am no longer interested but you could totally come to test the water and get interviews experience. Or even within 10 minutes raise a blocking point and leave.

Once I interviewed someone who was a great fit for the company, but not for that specific position, we kept it short, and I complained afterward to the HR who made both of us loose time. I hope that person is doing well