That doesn't seem right - doesn't Google let developers monetize extensions in the chrome web store?
You can publish Hosted Apps, Chrome Apps, Chrome
Extensions, and Themes in the Chrome Web Store.
Collectively these are called simply "Items". You have
many choices when it comes to making money from items
that you publish in the Chrome Web Store. This page
covers just a few ways to monetize your store item:
- In-app payments
- One-time charge
- Subscription
- Offering a limited trial version of your item
https://developer.chrome.com/webstore/moneyThe issue of developers selling out their chrome extensions to 3P (that the author references) probably has more to do with the fact that bad actors get better money for harvesting user PII than the developer would if they maintained the extension as it was originally meant to be. This is a real privacy issue, but it's also why Chrome cracked down on extension APIs recently by restricting what is shared with the extension.