Not sure if they do for _this_ package, but the Wolf* people's model is usually selling certification packages so you can put their things in stuff that need certifications and you offload liability. You also get people that wrote it and that you can pay for support. I kind of like them, had a short project where I had to call on them for getting their WolfSSL to work with a ATECC508 device and it was pretty good support from them.
As the project is GPL’ed I guess they sell a commercial version. GPL is toxic for embedded commercial software. But it can be good marketing to sell the commercial version.
You don't need a commercial version, many projects get away with selling just a commercial license to the same version. As long as they have the rights to relicense this works fine.