Because the future of the product now depends on the enterprise customers paying enough for it to not only fund the development but also fund the business backing it.
OSS works best when software is needed by many different enterprises that all need it for their business but it isn’t a direct revenue generator. Because then the future is guaranteed since all of those enterprises will contribute patches and it makes financial sense for any of them to take on the maintainership.
Docker Desktop has always been a single point of failure in development terms not being OSS, but the community of users just got slashed not that there’s a price tag attached to it and by charging Docker has basically said that the future of the product now depends on it turning a profit instead of before when it only depended on Docker Inc overall turning a profit.
