During Easter I traveled with a group of friends. Every time we wanted to go some place, we had to make a decision between walking and taking transportation.
I use Google maps, my friends use HERE maps. HERE always shows double the ETA of Google maps when it comes to walking. We kept arguing which is more accurate with no result.
Personally I have the same problem, my speed is mostly slower than what Google tells me. I thought Google does this based on historical walking speed for every person (I have location history enabled). Apparently it is hard coded at 12 minutes per kilometer, or more accurately, 20 minutes per mile.
We are afraid of AI taking over humanity, while someone at Google maps hard coded that all humans walk at 20 minutes per mile.