For the same reason people on the wrong countries aren't allowed to contribute to US projects.
The way things are going it becomes a national security issue where those PR are coming from.
The way things are going it becomes a national security issue where those PR are coming from.
And TBH IMO such projects should be avoided in the first place regardless of what US is doing because they tend to use FLOSS as a marketing method than for practical development. Choosing projects which have multiple shareholders, so to speak, is much healthier in the long term.