They have a paid version of the Nova launcher. I am certainly not a lawyer, but it also looks like they have a pretty clear privacy policy https://novalauncher.com/privacy/
I don't currently use it, but it is a nice alternative if they aren't doing anything fishy.
Except FOSS explicitly implies the user is free (as in freedom, not 0$), and the software isn't a product or service, but a tool.
That line only applies when a non-free service or software that's supposed to be meant for profit doesn't have a clear money income. Don't compare "oh how generous is google for giving me free email and drive for no shady reasons at all" to "i host my own email and cloud using foss projects".
Also, windows is basically spyware with a bit of unoptimized OS on top and you still (should) pay for it.