Microsoft has started this, sort of, funny campaign to encourage Windows 10 users to keep using Edge instead of installing Chrome or Firefox. It looks like this:
Twitter users started reporting this earlier today and tech news sites picked up the story, confirming it.
This screen however does not stop you from installing Chrome or Firefox. You can click “install anyway” without feeling guilty and continue the installation.
It it is just Microsoft begging you to use their browser, don’t you think?