So you're using the slippery slope as justification and welcome sign instead of warning. The world is all downhill from here exactly because people don't have the integrity and courage to resist.
Also
I can hire 2 guards who can remember people by taking a photo. And then I can have them recall who shows up. With people.
All my project does is substitute a computer for human. The only reason why we don't do the above is because people cost a lot more. Computer software and cycles are cheap.
And the procedure I used with my code saves a hash of the face. I cannot generate faces from the hash, although it would be a one liner to spool a face to the hard drive when a pic is captured. My software doesn't do that.
And also, CCTV isn't open to the public or traded around wanton. Instead, I would argue, this data is highly confidential to the business and therefore would guard it selfishly.
And as for the pub photographing: There has been a trend in bars in Indianapolis to scan he barcode on the back of the drivers license to "verify identity". What they're really doing is building up a clientèle database for which they can do whatever with. And they are booming bars.