It takes 5 minutes on Google to show that
1) "Polynesian" searchers are dominated by corporate marketing BS for Disney, restaurants, and travel agents.
2) Polynesian/Pacific Islanders DO use "poly" to refer to themselves.
It takes 5 minutes on a Twitter search to show
1) No one is going to confuse a tweet about poly- chemistry stuff with a tweet about poly- Polynesian stuff
2) It is often very hard to tell poly- Polynesian tweets from poly- polyamory tweets