I think your comment is misleading. Most fonts in use on the web today are actually proprietary and not open source. https://jichu4n.com/posts/the-most-popular-fonts-on-the-web-... -- Arial, Verdana, Tahoma, Georgia, Helvetica are all proprietary.
The topic at hand is fonts you have to buy a license to use from Monotype, and fonts you can use freely.