Part of the problem with city planners is that much of their job is just alleviating car traffic. And if they were successful at doing (like making good public transport and walkable cities) they would have far less work, and be put out of a job.

That being said, I think they would realistically just start working on other city issues, but I think that’s the mindset that keeps them building this kind of stuff.

I bet there’s also a factor of that things are already going in this direction, and there’s already more demand for driving, and it’s far more difficult to go against the grain.

Wishful thinking, but the fines are far greater than any business would be willing to pay as a bribe

The legality really depends on the jurisdiction. Where I live, it is 100% the business responsibility to ensure this doesn’t happen, and if it does, there are big fines for the business, the customer is not at fault.

Plenty of things the business could do to reduce this, such as making people park up after ordering (a very popular option where I live), increasing prices to reduce their demand, having a digital queue system, removing the drive-through altogether, etc.