I'm unsure why anybody who isn't a lowlife thug scumbag should have any issue with football banning orders being extended to include rail travel? Ideally they'd extend to everywhere beyond the recipients' front doorsteps, but that's a different conversation! Unless you're suggesting that they are imposed in a manner that is questionable?I assume we are all ok with extending football banning orders to trains and using drones. Are we ok with central camera usesage/access? if so why is travel card data such a no no?
As for tracking passengers' travel patterns, sadly that seems an inevitable development to some degree in this brave new era of electronic ticketing. Unless it's intended to create an offence of 'spending too long on the Underground' I don't really see what the BTP, particularly with their extremely limited resources, are likely to be able to do about it. Most of those who might be 'of interest' are probably going to have hugely varied travel patterns, whether their intentions are innocent or otherwise. Once they're inside the system, they won't be found until they emerge.