They look like springtails to me. I use springtails and isopods in my gecko's terrarium as a clean up crew.
The isopods eat the poop while the springtails eat any mold that would grow in moist conditions. I do have plants in there too so all that bug poop goes right back into the soil to be reused.
They can't survive outside of a moist environment for long and will simply dry out. I have no idea how harmful they are to plants alone but at least you don't have to worry about mold.