I disagree with them here, but I think their point is that they're aiming for a certain type of customer, and you aren't a good fit for their business.

Not every business wants every customer. Some businesses know they can do very well if they keep their costs-per-customer low and their revenue-per-customer high, even if they have to have fewer customers to do it.

Some of those "contact us" companies are in that situation. I think that most of them aren't, but wish they were.