Core.js just happens to be popular on NPM, so it's the one that ends up being used more often. There are alternatives, for different situations, and different environments, some of which have been around for as long as core-js or even longer than core-js, and are in fact funded by large companies just like OP thought. Source: about 1 year ago
Include https://polyfill.io/v3/ for everyone else. Source: over 2 years ago
Do you know an article comparing Polyfill to other products?
Suggest a link to a post with product alternatives.
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