The people who own the mall don't care that they're losing tenants because tax write-off structures in other businesses they own mean that having property that loses money is incredibly profitable and they can sit on that tax write off for a long time until the property becomes valuable again for a different reason.
In the case of movie theaters they know people are going to figure out that the ads are running and either show up late or use their phones to hang out before the movie actually starts.
Now the people buying the ads no that nobody's really paying attention to them all that much but it's their job to sell ads so they don't pay too much attention to that. As long as they can get their boss to sign off on the ad buys they've done their job.
There are entire advertising industries that only exist because they have existed for a long time and the people involved are good at protecting their jobs. They stopped working ages ago.
That doesn't always happen mind you, if you remember one video game magazines stopped publishing it was way further along than you realize, like mid-2000s. The internet didn't actually kill video game magazines Big Data did. Companies like EA and Microsoft and Sony and Sega were able to run the numbers more effectively using big data tools and figure out they weren't getting any sales out of the magazine ad buys anymore. So they stopped advertising and the magazines went tits up because it's not the sale price of the magazine that keeps them going it's the ad buys