Earlier quoted context omitted.
You’re intentionally returning unsigned contacts to employers hoping they don’t notice? Seeing how you’re first action in each of your new jobs is done in bad faith I think I see why you’ve had to fill out six of them…
You could easily get by by saying it was just a mix up and you emailed the wrong PDF. Not saying it's ethical though. I'm also not really sure which situations an employment contract would really hurt you in tech besides maybe some IP stuff. NDAs are usually separate.
IANAL,but they're still enforceable, especially in the grandparent's situation where the grandparent's work product was accepted and they were paid. There are realms of contract law where signature compliance is more prescribed like probate.