Earlier quoted context omitted.
I think that when CF say unlimited bandwidth they really mean it. I manage a domain on the business level plan for a domain and I pushed over 1PB through it in January. Not a single complaint from CF and no sales calls pushing enterprise tier. They haven't clarified their file operations costs yet though. That could get pricy but will more than likely be cancelled out by the egress savings for most use cases.
Not saying your experience isn't true, but I've heard horror stories of accounts being disabled for using too much "non-HTML" bandwidth, even on business level ($200/month) accounts (at the single digit TB level). The limits seem to be arbitrary and ill defined. CF may be great technically, but I personally wouldn't use them without an enterprise agreement in place. Bandwidth should be cheap, but cheap does not equal…
That would depend on the use case I'd assume.