Well they were net positive before COVID. Then the fares crashed and needed bailing out by the central government who don't like public transport or the London

Well they were net positive before COVID. Then the fares crashed and needed bailing out by the central government who don't like public transport or the London mayor. The government are now much more car boosting than they were so anything that decreases the voters' perceived need to use cars or restricts their use is cut back.