The primary offender in Labs low gear run is LEDX drop, that thing sells for 800k+ and spawns at basically one place, such a 1 slot item honestly shouldn't even exist. So low gears just rush there hoping to get it. It's a rare-ish spawn but doing some math you can basically fail to get it 6 times and still profit. Really really hope they either make the item more common so the price isn't so high and definitely spread it around the Labs, so these people actually have to roam around and fight off raiders and other players to look for it. In fact, this needs to be done on every map, static spawns just promote hatchling/low gear runs. There should still be high value loot areas of the map, that you would still have to look around and possibly have scavs spawned there from the start so hatchlings would either be stopped or delayed enough for geared players to catch up to them.
All that being said, in Labs I still find a decent amount of geared people. Pistol Labs runners can only really be found at the 1-3 places and then they extract whereas the geared players stay to fight off scavs. The issue is that it devalues other maps, both in terms of XP and money gained. So if you're looking for xp and money, which most people are, Labs is best by far.