Was visiting a local mall in the north most central area the other day that I mostly avoid due to these signs, but only go if I absolutely had too.
Disarmed to enter and i noticed they didn't have the required IL sign or even policy signs (which can be ignored legally) up about firearms prohibited. I walked around inside to the other entrances to see if that one fell off and noticed they all lacked the same signage. My guess is since the mall was dying from people avoiding the mall that had gang activity the last 2 years. with the the signs not allowing you to go armed, it swayed some people from going. Also a good chance to sue for liability since they was no police presence to be found and only security that wasn't armed.
They did increase police presence, saw 2 officers while walking, but felt good that maybe business's are starting to wake up and find out Law abiding people aren't the problem.
I am aware that most insurance companies force business's to put these signs up, but maybe too they are realizing that it could be less impactful on them.