My Italian ISP, Fastweb, offers a service called wowspace for like 9,95€/years that offers unlimited cloud storage via a clunky web-app.

Turns out that's really a nextcloud with mustaches, and if you fiddle enough with the web ui you can extract a login token to use the desktop client.

I haven't bothered because i already run nextcloud at home... but yeah, businesses use nextcloud in a number of ways.