Worst cases
Worst cases are bad things that happen if we design or run this wrong. We pick licenses and hardware and design and data in order to minimize the risk of these things happening.
Rather than edit a case, it's better to write a new one that is more or less general. Stick to things you think really can happen. If you think they can't happen, they are threats.
Microsoft, Monsanto, oilcos, or other enemies create their own modified schema, AND modified software. The modified software works with and even EXPECTS the altered grammar, and now you have a fork. Each promoter of a new fork gets "friendly" content poured into the altered grammar that we can't get first, and (depending on content license and source) can't even copy or validate. The "new improved" Corporate Consumerium takes over with careful marketing of itself to retails. Since it serves the interests of retailers, and maybe pays them, it will be preferentially installed to use the standard hardware deployed to those retailers by Consumerium. We get crowded out, like Linux has been crowded out.