Despite pressure at various ICAO meetings, nothing has changed - perhaps the combination of legal liability and cost is the reason.
Back in 1969 the Australian Department of Civil Aviation who provided obstruction charts used by the domestic airlines, changed it's policy and demanded operators be responsible for their own obstruction charts. The outcry from the airlines was ignored. It then was discovered that the DCA Flying Unit operating F27 and DC3 aircraft still used government (tax payer) provided obstruction charts and the airlines demanded they too should be allowed access to these charts.
DCA soon fixed that little problem. The obstruction charts provided to the DCA Flying Unit were withdrawn and for years the Flying Unit aircraft operated unprotected - responsibility for obstruction clearance being foisted on to the pilot. On one occasion, DCA "borrowed" the obstacle clearance chart for Alice Springs from one of the domestic operators manual and quietly slipped it into their F27 (DCA) Operations Manual. Copyright was disregarded. For several years this chart was used by DCA until someone pointed out that the chart had been cancelled a few days after initial publication in the airline manual due to a major mistake in the design of the chart.