While a certain amount of concern of other companies doing questionable business is valid, to a point, be careful.
I had to assume it was jealousy, but one character here tried to interfere by posting a note on a brush pile for the city crew to find - it was my generated pile (we left it to return with the chipper, which was busy elsewhere). Unfortuneately for this character, the city crew knows me well and immediately found the note signed by "me" and denegrating to their effort, knew immediately I didn't and wouldn't write such a triad. Even without my input, the note went immediately to the city police who reacted with a charge of and arrest warrant for forgery. He WAS arrested.
Turns out a new start-up outfit w/ hard times finding work, thought I was pruning professionally and left the hauling to the taxpayers. I didn't press charges but left this fellow with the impression that NO ONE messes with my work...am familar with his work and wouldn't hire him to rake leaves in the Fall, let alone go near trees.