> From the screenshots, I think it is only a fake wet signature. I'm not sure how valid that is
Welcome to 2023! I've bought a house, incorporated a company, signed a work contract and contracted a lawyer just based on Adobe mobile wet signatures on PDFs.
I use the Preview App that comes standard on OSX. You scan a signature on a piece of paper with your webcam. Then you can just "paste it" anywhere, I even give it a dark blue shade.
I had a single person give me shit and say they needed "ink on paper" insisting me to print/sign/scan. I just ran the PDF file through a website that makes it look like it was scanned with some imperfections and tilt. I wouldn't be able to tell it myself.
I don't trust any websites for that. Instead I display the document on the laptop monitor where the page has a white background but everything beyond the page is black. Then I use my phone's builtin scanner to "scan" my laptop screen.
I honestly did look at conformed signatures etc with a desire to do things "properly". However, all too often it was a problem - so fake signature it is.
I do one extra step and "print to pdf" so that signature and annotations (if I have typed in content on a form) are flattened in the final pdf.
Adding to your list, even government documents as well as those related to my medical practice and licensing/registration stating "electronic signatures are not accepted" have taken the wet signature from Apple.
Presumably this is all valid?