"free to use and develop" doesnt mean "free to use as you like". Roon has stated there is a contractual requirement for using the term Roon Ready.
The roon website states (
https://kb.roonlabs.com/RAAT etc)
"
Enforce high quality user experiences via a certification program. User experience is another core competency for us. We are actively pushing hardware companies to make better user experiences by iterating with them on the product before allowing them to be released. We require parity between RoonReady integrations and other audio protocols offered by the devices, ensuring that Roon support does not become a second class citizen. Another requirement of the certification program is that hardware manufacturers leave devices with us long-term for support and QA."
And this:
"
Roon Ready is the highest level of Roon integration available to partners, and means that Roon technology is actually customized for, and embedded into, thei devices.
It's a designation given to audio player hardware products that have both implemented
RAAT, and have been certified by Roon Labs for proper implementation."
Note the "and have been certified by Roon Labs"
Not "and might be certified by Roon at some point in the future"
Now this is not the signed contract between a developer and Roon. But I think Roon's position is clear, and has always been clear.