WalterT Hi Walter. No, one cannot use the source code "however you want." That is factually incorrect and irresponsible to say. The MPL 2.0 license does place stipulations on the use and distribution of the source code and the products and derivatives created from it. ZWO and any user of products derived from this source code must honor this license; no one is absolved from doing so unless the copyright holder(s) grant specific permissions.
That said, I hope that ZWO compensates Stefan for his efforts if they choose to incorporate the logic into their commercial product and benefit from it.