Yes, it has sense, :-) #CiviCRM is a #CRM. So you can use to manage #memberships, #mailings, #forms, #pledges, #events to attend (free o with payment options).
@nextcloud has another bunch of features, hasn't it? #FileStorage, shared #calendars, shared documents, etc.
To resume: CiviCRM is a tool for an #organization, to manage its #contacts/members, launch #funCampaigns... And #Nextcloud gives services to the #members, usually to work together, #intranet, etc.
Both are great!