Free and open source means the software is being offered for free. A lot of times software packages and they're inherent future releases are part of a paid for package even if it's Open Source. Common mistake.

What is your recommendation?

It's seems to be over my head. If I see a code of a product, it's viewable, source verifiable, but not OSS? If I can take the code and use it for other things, it's FOSS? But what is OSS without an F? OpenSource software is..? Must be free to use and change to be called OSS?

SeedSigner Bitbox Foundation Passport Trezor All are Open Source.