Yes, what about them? If you read the Terms of Service for any of them, I imagine you will find they all prohibit you from using their site in a "automated" way. Took me 30 seconds (Search: Bing Terms of Service) to find this:
9. How You May Not Use the Program
You must not at any time use the Program to harm others, or the Program. For example, you may not:
- engage in, facilitate or further unlawful conduct;
- use the Program in a way that harms us or our advertisers, affiliates, resellers, distributors and/or vendors, or any customer of ours or our advertisers, affiliates, resellers, distributors and/or vendors;
- use any automated process or service to access and/or use the Program (such as a BOT, a spider, periodic caching of information stored by Microsoft, or "meta-searching");
- use any unauthorized means to modify or reroute, or attempt to modify or reroute, the Program;
- damage, disable, overburden, or impair the Program (or the network(s) connected to the Program) or interfere with anyone's use and enjoyment of the Program; or
- resell or redistribute the Program, or any part of the Program
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