The Checkmk Cloud Edition includes a free tier up to 750 services (basically converted the 25 hosts to services).
This is equivalent to the Checkmk Free Edition.
The main reason for this is that we wanted to reduce the number of builds which we have to do. And as there was no license management in Checkmk previously, we had to build a different software package to make something like the Checkmk Free Edition. Now with the Cloud Edition we have a license management feature. Therefore we were able to merge the Free Edition in the Cloud Edition and reduce the number of builds.
As a user of the Free Edition, therefore nothing actually changes for you (except that instead of 25 hosts you can now have up to 750 services and that you have to use the Checkmk Cloud Edition builds).
The Checkmk Raw Edition stays untouched from this.