The technology is just means to an end. Would you be ok if security had a big wall with printed pictures of undesirables and kicked her out due to this?
Low-tech and easy to enforce.
And much less disruptive to the target, because they get told in advance and don't drive and park and go in and plan only to get kicked out.
Of course banning people based on where they work is bad for business.
https://news.ycombinator.com/item?id=34075624
But I think we are on the same page anyway