The only way they should be enforceable is if they use that scrolling trick, then quiz you on all the terms (with at least multiple choice), every time the TOS is updated.
Despite sounding absurd I think that would actually work really well. It would make it functionally impossible to include arcane BS without driving off customers while also filtering out people too stupid to be trusted with any sort of online account.
I'm reminded of Mitch Hedberg's bit about getting a receipt when buying a donut. "I don't need a receipt for the donut. I'll just give you the money, and you give me the doughnut. End of transaction!"
Why do we need massive TOS for stuff? I'll just give you the money, and you give me the service. End of transaction!
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