Its better if Google fix their system to filter scam/phishing sites and remove scam/malware app on google play first. While they announce this will get massive adoption on cryptocurrency (especially NWC token), they also make newcomers will get scammed after fall to phishing sites.
I wonder why google want to use NWC token besides BTC or ETH? Or google hate BTC and ETH

I don't think you understand the article correctly. Google will never use NWC token. I'm not sure they even using btc or eth.
They are just allowing people to buy the token through their payment getaway Google Pay (they probably get a fee from it, that's why its in their interest) and for the project they allow a easy 1 click payment options to sell their coins. Looking at NWC chart it has its benefits.