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."

If I'm on the jury, I'll make sure he walks.

The only valid agreements require the party seeking the agreement to make efforts in that pursuit. Did a human view the signed agreement afterward? Do they store that signed agreement in such a way as to be able to retrieve it if they need to contest the terms later?

Then no agreement was made.

And as for the CFAA provisions, if they put those resources on the public internet, then the public has the right to interact with them. You can't fence off the sidewalk and claim that someone trespasses when they walk on it.