Because they can? Based on specs for every other rangefinder I have seen, I hight doubt 2000 yard range. Normally they report max range using a reflector and real range is half or less.
Given how many people miss at 40 yards, being downrange of a 2000 yard shot would be disconcerting but probably not a lot more dangerous than walking across a major road.
I’m not sure most run of the mill hunting rifles have the elevation necessary to cant the scope down enough (pointing the barrel up) for shots at extreme ranges. You have to modify the rails a bit (a lot). The super sniper shots you see reported are sometimes using weird periscope/prism type things to see beyond the barrel.
The Ukrainians (and probably Russians) are using tech that automatically adjusts everything for wind speed/temperature etc. Fascinating stuff but out of my pocket change range.