A sweetgum is totally worthless. It provides no shade, is only a part of an extensive root system producing more of its kind, scatters miserable prickly balls everywhere causing human feet to slip out from under the pedestrian, and if you cut down one of the miserable things, the wood cannot be split for firewood. Further they suck up the water and nutrient from an otherwise nice lawn, turning into eyesore dead land. As far as chewing the resin, Wrigley's has no need to fear of the competition.
Speaking of worthless, what is more worthless than a lawn? They're biological deserts that only serve to comfort feeble people who are afraid of native plant diversity and real wildlife like spiders insects and lizards and moles. People waste millions of hours per year mowing them and dumping toxic chemicals into them which then run off into rivers and lakes, then they spend millions of hours complaining about the neighbors who don't. I'll give $20 to any tree that can suck the nutrients out of another pointless lawn.