I've signed and returned almost everything requiring a signature for years this way, you can even have multiple signatures (helpful when you need spouse to sign something too...) in Preview to speed up dealing with these kind of tasks. I've never once been asked to sign it with a pen instead, even for relatively complex transactions like houses/cars.

Because Preview lets you draw the signature using the TrackPad and a finger, I've had no difficulty making a very convincing replica of my actual signature in Preview.

While the linked tool may "look" more convincing with fake photocopy marks etc, for just signatures its not been necessary to go beyond Preview for me ever. In the US so much business is conducted on paperfree platforms like DocuSign etc that I don't think many people even notice the fact the signature is digital anymore, given platforms like DocuSign do more or less the same thing.

I had passport photos rejected due to my eyes being too shaded or something. One eye seemed a little darker according to the error messages. I tried taking new photos, including ones from I paid for (done at a pharamacy) and still failed.

In Preview I copied one eye and put it over my troubled eye, reversed. It worked.

I’ve been though face detection systems in various countries (US, UK, France) and I seem to get through ok.

I knew that, and I do run macOS, but the signature always looks "digital" to me. It's not bad, but with Krita and it's pen or pencil brushes, in combination with a decent drawing tablet (well, as decent as a Huion screen tablet is) with a pressure-sensitive pen, I can get something that looks outright indistinguishable to a physical signature.

Also iOS