

As far as I know Zorin is FOSS, for what it’s worth. It’s mostly just bundled FOSS software with some slick themes and accessibility features, plus a few in-house system apps which they do seem to provide sources for.
They mention that it’s open source on their website but they don’t mention FOSS probably because the libre/gratis distinction is confusing for people.
Being able to sell FOSS is one of the freedoms “free software” refers to.
Honestly though I think the thing that struck me the most and I found kind of scummy was their “value statement” where they were advertising the OS by comparing it to the prices of the proprietary software is includes alternatives to. You misreading the website wasn’t an accident, they designed it in a deceptive way IMO.
If they were more honest about it, I wouldn’t have any problem with them charging for the convenience of having everything pre-bundled. Of course you could set everything up yourself, but Linux is notoriously finnicky. People want a complete experience, they want support. They want the slick branding.