If you fly to US, Singapore, and many other countries these days, your face will be photographed and the photo will be matched to your passport photo via facial recognition (the machine tells you that outright, and does the action on the spot). They also take your right hand fingerprints.
OK.
I think flying to a country is a whole lot different than a little tickmark on a website, sorry.
Don't forget that if you fly to a country you are also bound by their laws. They can do anything to you as long as they can make it stick under their laws. It's one thing that people often don't realise when flying somewhere, you are basically giving a blanket submission to their laws!
For this reason I have a long blacklist of countries I won't visit because they have laws I do not accept.