The only reasos to run this tor bullshit is if you're doing something dodgy, or you're running an illegal service, such as a web site to take payments in bitcoins for ransomware. Or if you're a paranoid tinfoil hat wearer.
Tesco are doing risk reduction here. If a phone has tor on it, it's also likely to have all manner of other crap on it that can only be used for sometbing at least partially illegal, or the user has such a low grasp on security that they feel the need to load it in the first place. The same for rooted phones. A rooted phone is much more likely to have malware on it just by virtue of it being less secure.
And don't start that bullshit about bloatware. Yes, it's good to remove all that shit, it only serves greedy advertisers, but not at the expense of rendering my phone more susceptible to other malware.
I'd sooner check my balance on an android than Windows anyway
Biting the hand that feeds IT
