It's called "topping" or "pollarding" and is a managment strategy. In residential areas it is a dumb idea and can lead to complications. There are VERY GOOD reasons to do something similar in agricultural and pasture managment situations.
Sorry if this isn’t the right sub, but every established tree in my local area was cut like this in the past 6 months. Whats the reason for doing this? https://www.allforgardening.com/785596/sorry-if-this-isnt-the-right-sub-but-every-established-tree-in-my-local-area-was-cut-like-this-in-the-past-6-months-whats-the-reason-for-doing-this/

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