Do not accept terms and conditions

For mandatory T&Cs I'll put in the signature box "Decline", including updating the HTML page to say "decline" instead of "OK" and screenshotting it or modifying the HTTP response sent back to include riders.

I know it probably won't matter, but it's kind of fun for me.

No chance that would hold up in court. Clickwraps have been tested in courts and are fully enforceable.

And keep in mind that (at least in the US) the opposite of "I accept the terms and conditions" is not "I get to do whatever I want," it's "I am accessing this service without authorization, which is a crime under the Computer Fraud and Abuse Act."

Are you implying that if a US "service" consists of e.g. publicly accessible HTTP endpoints, it is illegal to use these endpoints in the US without "accepting" some terms and conditions that the provider of these endpoints requires its users to accept before using them?

I do not understand how such a requirement would be legally enforceable for public endpoints.

You can reasonably assume that if no terms and conditions were offered, then your use of a publicly accessible endpoint is authorized.

But if terms and conditions ARE offered to you, and you bypass acceptance somehow, then you're knowingly accessing the system without being authorized.

I really doubt this would be prosecuted except as part of some much larger misbehavior, but it is there.

If I use wget to mirror a site and there are terms and conditions that I never see then I'm "using a public facing API while being unaware of terms and conditions".

So, then what?