It is a little of both.
crossing is not really free or random, but the basics are that they take 2 plants which look good and cross them. nice seedlings are grown and sometimes crossed again (and again, and again etc).
If they have a plant with nice colours and that grows fast they put it in TC.
Fact: the owner of Carniflora couldn't state what is in the cross even if you offered him big money. There are no records for most plants.
You have to understand that this is a commercial nursery producing most of it's plants for the general public who doesn't care beyond that it's a sarracenia and IT EATS MEAT, Whow!
Great plants, but not for the advanced growers, just a friendly priced way to start someone on a hobby