"Consumer Internet" is a market - offering a product / game / service that appeals to the consumer, vs "SaaS / MicroISV" which is a delivery strategy (software as a service) or a business definition (independent software vendor with one developer).
I would say it is used to describe services targeted at consumers (particulars) as opposed to businesses. I don't really see what could be confusing you... could you come up with a concrete example of an ambiguous usage of "Consumer Internet" ?