Who cares? Mass surveillance is the norm commercially. for commercial advantage. When you browse you drag around loads of scripts. Some are poorly designed and do not complete leaving you with debug (waste of time) or stop options. Browsing is like walking though long vegetation and collecting endless burrs.
Electronic surveillance by GCHQ does not worry me in the slightest. I am not a terrorist or a foreign country out to steal information from companies or bring down the internet.
I suspect mass surveillance is working quite well in the UK as we have relatively few successful terrorist incidents though there is no way all can be stopped.
As to how well GCHQ is preventing information theft etc- who knows?