They offer (extremely) discounted Claude prices but you have to go through their gateway. They subsidize part of that, and they get the low price by reselling unused Max capacity, there's been a few posts on that in the past months. People are apparently getting 90% discounts on their claude use this way, tradeoff is that you have two companies learning from your data, instead of just one.
So people use the same tools they use normally, but get it for a lot cheaper