I'm not entirely aware of American's stand on blocking those countries to services; have they made a blanket ban on accepting the services or connections of people from those countries?
I can sort of understand the reasoning behind him being concerned. He suggests that it isn't worth risking the jail time or fines, but he doesn't necessarily support censorship, because lets face it for the majority of people they don't want to risk jail time or fines over something like this. I know there's an argument that being scared into complying, and then using his position to convince others is support censorship.
Given his position as a Core developer though, it's a odd one.
If one government can force all its citizen to start censoring other bitcoin users with threats of fines or prison time, then any government can do the same.
To be fair, most governments do censor their citizens. Whether, that's Bitcoin or something else. China, is known for censoring certain social medias, and news sources. It's no different for the US.
This reminds me of a forum user who wondered if miners could be held responsible and liable, when they validate a block that includes transactions related to the drugs or weapons trade. This to me is the antithesis of what Bitcoin is supposed to offer the world.
Technically, if mining is illegal in the country that they reside in; yeah, it would be illegal, and therefore they could be held liable for breaking the law, if they are validating blocks. Although, I'm not aware of many countries that have outright banned mining. However, it's potentially something that could happen, obviously it wouldn't be right, but usually censorship isn't anyway.
If someone is living in a dictatorship that would fine or jail people for running a bitcoin/LN node then maybe they should be the ones running their node through TOR or stop using bitcoin altogether. The number of countries US has sanctioned is far higher than just 5 and things are going to get worse the weaker US dollar gets specially as bitcoin adoption grows globally while more countries join the "dedollarization" bandwagon.
The thing is; if there isn't enough people that care, and kick up a fuss it'll likely lead to this. I don't know if the government would be threatened enough or if they'd just prefer to regulate Bitcoin so that they can profit from people using it, but tighter restrictions will likely be put in place around the majority of the world. Mainly, for them to profit from it.