FR is directly accessible at http://209.157.64.200
The domain name merely maps to that address.
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Which means you can still get to it if they block or remove the record from the DNS resources, but that doesn’t mean IPs can’t be blocked. Still I think the later would require ISP cooperation and would be much more drastic a move.
ISPs blocking would be a severe action, probably violating “common carrier” laws. They’d be sued, customers would switch providers, and (acting as originally designed) internet would largely route around blockage. Worst case, there’d be a market for new non-censoring ISPs & backbones; some viable & interesting tech is waiting for the opportunity.