It costs the channel owner for every platform they join. So while it is free to the customer, the channel owner only receives advertising & sponsorship income in return for their outlay.
TPTV has invested in a Satellite slot, which makes them available to both Sky & Freesat customers through just one deal with the Satellite operator (SES).
The slot they have on Freeview HD has restricted coverage (70% of the UK). This is currently supplemented in 2 areas by taking unused airtime on local TV stations in Brighton & Swansea.
While VM carries most of the other Freeview channels, the ones with tighter budgets have either gone down the subscription route on VM in order to afford a slot (eg Horror channel, CBS Reality) or not joined at all.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile