Right. Some Grab routes are clearly wrong in Bangkok. For example a few years ago the Grab app would route drivers to the Renaissance Ratchaprasong via Ratchadamri Road (which does not connect to the Renaissance). You can get close via Ratchadamri if you enter the side of the Hyatt Erawan and swing around through the shopping center parking lot, which ends up near McDonalds. It does not connect to the Ren., unless you can climb a wall.

Another example is that Grab often routes drivers to the Ibis Sathorn via Khlong Toei which gets them on the wrong side of the railroad tracks and makes them go several km out of the way in order to cross the railroad tracks. It was crazy not to route via Rama IV and Ngam Duphli Alley or Sathorn (and Sathorn 1 Alley). It was very frustrating, and probably was for the drivers too. I had several drivers cancel a pick up there after they started only a km away from the hotel bc they ended up 3 km's away and 20 minutes away from me.