Here's your missing quote from Sportsbet:
3.5. You are allowed to have only one Member Account. If you attempt to open more than one Member Account, all of your accounts may be blocked, suspended or closed and any funds credited to your account/s will be frozen.
Nobody reads all the Terms and Conditions, Terms of Service, Privacy Policy, User Policy, EULA, and so forth that they should. You would never be able to leave the house if you did. Every component in your computer has tons of legal jargon to go with it, as does the service which built your computer for you, your operating system, your browser, the websites you use, your ISP, your electricity provider, and so forth. It would take you a week just to be able to log on to this website if you insisted on reading the legal terms of everything you needed to use to get here. Companies have previously hidden cash prizes in their EULAs or similar, and it has taken months for them to be claimed despite thousands of downloads. There's also one of my favorites hidden in the Amazon Web Services Terms:
However, this restriction will not apply in the event of the occurrence (certified by the United States Centers for Disease Control or successor body) of a widespread viral infection transmitted via bites or contact with bodily fluids that causes human corpses to reanimate and seek to consume living human flesh, blood, brain or nerve tissue and is likely to result in the fall of organized civilization.
I would also recommend the following site:
https://tosdr.org/ - Terms of Service; Didn't Read. It essentially provides easy to read and understand summaries of what you are agreeing to when you sign up to various sites. Unfortunately it doesn't have much crypto cover yet (Coinbase is the only site on there as far as I am aware), but a good resource nonetheless.