Whoa, Nellie. It's not necessarily illegal. AFAIK, it would not be illegal to use WWW::Mechanize to pull a copy of the PM front page every five minutes. But if one has an agreement with a financial services institution, and that agreement prohibited any use of their web site other than access personally and immediately directed by the authorized user, this could be a violation of that agreement. They have a habit of writing terms into their agreements that are to their advantage, rather than their clients' advantage. Said institution could include in its terms such a prohibition, and the penalty the institution could levy for a violation, but unless there is a specific law being broken, we're talking about breach of contract, rather than criminal charges.
I was suggesting caution, not a visit from the grim NodeReaper.
Spring: Forces, Coiled Again!