I once spent the morning rigging down two big Ash with a large buckthorn between them. The homeowner was aware it was buckthorn, but wanted something left for privacy, so we worked around it adding some good time to the job between the two large trees. When both trees were down, the homeowner came out, said they didn’t like how the buckthorn looked, and asked us to cut it down.
Several times I have bid a removal with a nice drop zone , only to return to find the tree’s “replacement” preemptively planted beneath.
I have an account with a beautifully wooded Llama farm, and last week we were removing a dead oak in one of the animal runs to the pasture. We topped out the oak this winter for the animals’ safety, but before there was access for the material. When we returned last week it became evident that this oak was basically a llama shitting post, and below the snow there was a solid blanket of droppings that the oak crispies had now settled into. Upon returning home after the experience, I promptly ordered a grapple bucket.