As long as you're doing your training offline and shipping the resulting learned models, I don't see this is a big risk. If you're planning on shipping software

As long as you're doing your training offline and shipping the resulting learned models, I don't see this is a big risk. If you're planning on shipping software that can learn online, then sure, use something else for that, or ask for a better deal from FB. I wonder what would happen if every company offered patented algorithms under these terms. Still wouldn't stop patent trolls, I'd guess.