I've used hardware from several open source, and not really open source, hardware projects that have attracted a lot of clones. The biggest problem is that the clones are often not exactly the same as the official versions. Clone can have higher version numbers to mislead consumers into believing they are better than others. Even something as simple as different connectors catch people out.
Over time it can become a confusing mess for everyone involved, making support of every clone impractical. If you want to offer some help to clone buyers, limiting that support to a list of approved clones, that meet minimum requirements, is a way of avoiding insanity.