It was inevitable. There were too many iBoxes abusing access to free content from stockcharts.com, and usually without even a thanks or attribution to the provider.
Quite likely, had those iBoxes similarly used ADVFN charts they would have been blocked too. Concentrations of embedded charts on frequently hit pages such as active board iBoxes are not a proper use of free (not to mention dynamic) web content.
Hence the old axiom, "One gets what one pays for."
(Including, apparently, sentences which end in a preposition.)