I agree with @jdaviescoates
My reading of that licence wording is the user who installs Fizzy to Cloudron must not then sell / rent access to their Fizzy instance as a service (competing with original Licensor).
Basically own (personal/group/business) use internal to the Cloudron hoster is OK, but they must not provide access as a paid SaaS.
I don't recalll which other app on Cloudron has similar provisions, but I am pretty sure there's at least one like that.