The problem with puttng kit in consumers broadband routers are this - at night, I switch mine off. If mine is the local neighbourhoods 'mast', no one gets a signal at night. I go off to Benedorm for a fortnights holiday.Whoops.
If I get nosey and m0dify the routers firmware, I can get the metadata for everyones calls.
If I move home and the new owners don't subscribe to Talktalk, goodbye service.