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Is this an out-of-season April’s Fool joke?

You can easily check it by WHOIS:

$ whois dev.
% IANA WHOIS server
% for more information on IANA, visit http://www.iana.org/
% This query returned 1 object

domain:       DEV

organisation: Charleston Road Registry Inc.
address:      1600 Amphitheatre Parkway
address:      Mountain View CA 94043
address:      United States of America (the)

# the rest of output omitted

And some hints gives Wikipedia: List of Internet top-level domains.

OVH no problems for years.

BUT choose domain that is also maintained by non-US organization.
Like national TLDs from the EU, or fancy like one., cloud., …

Immutable, doesn’t mean extreme secure. It’s a false sense of security.
It could be more secure.
But during a runtime, it is possible to overwrite operational memory, mask some syscalls, etc.

That’s my 3 cents.