It’s very inconsistent in Greater Manchester
Wigan has no timetables on show, neither does Ashton, Altrincham or Oldham
But Bolton, Bury, Rochdale, Shudehill, Stockport, Leigh, Middleton all have timetable leaflets freely available
I wonder if vandalism might be a reason in Wigan, as it doesn’t have an actual travel shop, just enquiry windows, the racks were out on the concourse accessible out of hours. Although having said that it’s exactly the same set up in Bolton
The problem with Wigan might be that the timetables are closer to the departure bays and other external features, so maybe the Paper becoming damp could have been an issue. The situation with Oldham, and I think possibly Ashton as well, is that they were placed in a trial area where no timetables were to be produced in order to see if passengers could manage without printed timetables, e.g. as Merseytravel has done the same in all their areas. Much of the phasing out of timetables is to do with Austerity cuts on Councils and cuts to services by Bus operators, and running on a fine margin with no money for printing timetables and the need to cut down on wastage as much as anything else.
However, in the TfGM area other bus stations sometimes carry timetables for other areas in the timetable racks e.g. I've picked up 635 timetables in Leigh in the past and I've picked up V1 & V2 timetables in Bolton, but its not always the case. Another loss is the closure of the travel office at Piccadilly Bus Station which had a lot of timetables and was located close to a lot of services.
Other recent places to stop supplying bus timetables are Wigan Council Libraries in Atherton, Leigh and Wigan; they used to carry large stocks. Another loss some time ago was Atherton Railway Station which carried supplies of all sorts of maps and timetables, including ones for West Yorkshire, Warrington etc. Tesco in Leigh sometimes has the odd timetable in racking at the front of the store.
Another timetable loss was the colour Vantage timetable that FirstGroup published on its own that could be taken from Vantage vehicles and Leigh Bus Station (sometimes), and stopped being produced at the pandemic. I was told TfGM didn't like FirstGroup printing this, so maybe that was a reason for its demise.