100% clickbait nonsense, a way for Google to try to increase their own business. This is tantamount to it's bullying if a company puts out an ad for their new flagship phone, some kids get one, some kids don't, and the kids that don't are bullied for not having the newest phone. Some kids will have the new Nike, some will even get new cars by the time they're sophomores/juniors. This is Google, in effect, trying to sell more proverbial Nike products or cars.
Apple has an interworking ecosystem of products it makes, spending an epic fortune over the years to develop it. No one else offers this level of ecosystem. As part of their ecosystem they offered an in house text messanger too. it has a color difference to let the user be aware that one is over the Internet, one is over the carrier signal. If groups choose to make the color green and blue of a bubble a status symbol, that is how it will be.
Apple doesn't make money off its messenger app like other companies do. It is to each company's own how they make their revenue. Some companies don't care color, how and why, they just need you using their messenger to monetize that usage. Apple adds its in house text messenger as a value add to continue to get users to stay/buy Apple hardware and actual revenue based services. This is business, nothing nefarious. Google isn't doing anything for anyone other than potential revenue using a buzzword bullying as a sales pitch. End of story.