For now. There is absolutely no reason to suspect that won't change in the future.

Well if the future is just a big black box, why is it reasonable to move to hosts outside the US?

If current conditions are not a good predictor for future conditions, isn't it equally likely that other countries (same as the US), could change in the future to sanction other countries and restrict online services operated there?

Is there a jurisdiction which doesn’t have such suspicion? The 1A can weather a lot and carries a lot of weight. Obviously in this case the government has carve-outs for these things but I suspect other jurisdictions have bigger carve-outs.

I don't think it has to do anything with UN and international sanctions, Iranians once negotiated in the Obama's presidency and made a deal with 5+1, after Obama, Trump broke the deal and the US is out of that now, but the rest of the world didn't, so it is just US sanction not "International" or UN sanctions.

On the other hand, blocking Iranian GitHub accounts is helping to change Iran regime? Are Iranian GitHub Users developing nuclear bombs there?

I don't see how that applies. We typically have backchannels and other recourse when we have differences with allies (like Obama had with Israel).