Same reason most people don't like banner ads. It's extra fluff the user didn't ask for, unrelated to the stuff they actually want to see. It's not the case here, but oftentimes the political messages can be large and distracting, think Notepad++. That's reason enough to dislike them, without getting into any of the "purity" arguments.
I would take those numbers with a grain of salt. That site claims I have a 3ms ping to a digital ocean droplet in Singapore. Either I have proven faster-than-light information transfer or that measurement is off by several orders of magnitude.