I don't think it is done to save money. I reckon it's done because the MVP tutorial they used when they got started used the CDN. Or they are using Wordpress an

I don't think it is done to save money. I reckon it's done because the MVP tutorial they used when they got started used the CDN. Or they are using Wordpress and the theme decided to use it (... I just checked mine as I recently changed the theme, luckily it doesn't do this). It might also be done because people don't care. If it ain't broke don't fix it.