Litchi Hub + DJI FLY APP RC 2

I have a dji mini 4 pro with rc2 i have watched a video on youtupe using Litchi Hub for waypoints. using Google earth 3d to work out heights needed to clear trees etc. i guss the 3d photos may be years old so have to give extra height to allow for growth. is anybody using Litchi Hub + DJI FLY APP rc2 any tips whot is the cost to use app. do you recommend looks very useful but can i trust it. thank you. ps have seen subject raised but looks like that was 2020 i believe Litchi Hub is different now.