It is just a general concern, not derived from this particular announcement. As marshray says the company has commercial interests in making people pay for thei

It is just a general concern, not derived from this particular announcement. As marshray says the company has commercial interests in making people pay for their tool chain, so it's only healthy to be a bit sceptical when they free a standalone tool. I hope to be able to use TypeScript for years to come, it solves the problem of opt-in types in JavaScript.