Perhaps a bit off-topic, but this is the only relevant SE forum. I sometimes come across RSS feeds with terms and conditions attached, such as one example permitting use for app-development (that would complement their revenues) but expressly not for any other purpose, and specifically statistical aggregation.
I wonder about the bottom line of legality about this sort of conditionality. The company has made the data public, without any sign-up. Can they legally enforce such conditions on usage? Of course they can sue for damages, but are they likely to succeed? Are there any legal precedents to be aware of? Much of course will depend on the legal jurisdictions involved, but if there was any useful guidance available for US/UK/European contexts it would be useful to know.