You're reading too much into things. you can't supply real time streaming data to a web site w/o paying the exchange fees - which as you know can be quite substantial.
I was going to ask that very question. Aside from how liquid the contract is, there is no information in there. Just because there is high open interest on a call for example, does not mean that there is substantial bullish interest because you don't know what else that trader has on. For example, If I was bearish institutional trader, I might take out a huge short position on the /ES but then buy a ton of upside calls. To someone looking only at open interest, you might think, "wow, look at all those calls being bought. I better go long." You would be on the wrong side of the trade, however. Hope that helps.