Hello , accor doesnt , but based on many reports there is little difference between gold and platinum (cant speak about diamond)

There was a booster in 2020 and 2021 but its done

My advice is to do as hotel_user said and buy the ibis card , then focus on properties themselves , as benefits are quite light from their program compared to US competitors.

If you are used to Honors (outside USA) and bonvoy then ALL is (in my opinion) more or less at the level of IHG in terms of benefits to elite customers