True. Well, you CAN write a cheque on anything. I'm not 100% sure the bank would be *obliged* to accept it - but as a formal instruction to pay money, they would need a good reason to refuse it.
I'd be slightly surprised at that. The site I pointed at was the first one I found, which happens to be Canadian.
Really? That's rather... anti-competitive isn't it? Seems very restrictive and an unreasonable term. I'm not sure they could lawfuly lock competing firms, offering novely, ceremonial, and personalised cheques out of the market like that.
And there are published standards defining what information has to be on the cheque, where it has to go, fonts etc. - so long as a cheque meets these standards 100% I don't think they would have a lot of leeway to reject it. And since cheque processing is automatic, in practice it wouldn't be rejected anyway.
I think it would depend on the wording on the cheque, AND on the card; it's a combination thing. Remember, the guarantee is only of use to the person accepting the cheque - who can't be expected to know the details of the T&C between every customer and their bank. If the cheque and the card match, and in combination offer a guarantee, they would be entitled to rely on that as binding.
Mike