Great
Considering the general case. When any business uses this model, they have an open source "community edition" of their software product, which lacks many features of the commercial versions. It is indeed freely available under an open source license and fully functional. There will be many happy deployers of this version. If this was the only version available, there would be no issues.
The proprietary versions are significantly different from the community version, perhaps with both the user interface and the functions. While paid licensees are often entitled to source access to this version, the proprietary licence is not perpetual -- if the customer ends their relationship with the vendor, they lose the right to use this version.
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