Murena vs disroot

You're comparing apples to oranges as they say, Disroot is a volunteer group/organization who runs a suite of services (one of which is Nextcloud) which is intended toward a specific type of audience as a group of like-minded individuals; it is run by a named set of admins and is much closer to a foundation in an organizational sense which accepts donations to keep things running. Murena is a for-profit entity selling you Nextcloud-as-a-service without the underlying belief system which fosters Disroot.