Perfect Chicken is probably a symbol group/franchise. When the contract ends, many shops don't bother to change the sign, but they have to under their terms and conditions. So they often make as small a change as possible so they don't 'alienate' their customers.

Or because they don't want to spend money.

The Tower of Babel is an interesting project, although many of the better looking shops have had less money spent on them than many of the ugly ones. I've seen shops have huge sums paid for inappropriate shop fronts and signage and look awful, so the idea behind the Tower of Babel is a little skewed.