I'm a tech consultant who has been building email systems for over 25 years and using email for over 35 years.
Google didn't "take over the email ecosystem", and any suggestion that they did so displays a complete lack of understanding of the email ecosystem.
Gmail provided a better "free" email system than Hotmail, etc. There are many, many ways to use email that don't involve Google, many free or so low cost as to be insignificant.