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my %services = (
    service1 => { email => \@maintainers },
    service2 => { email => \@maintainers },
);

my %services = (
    service1 => { email => [ @maintainers ] },
    service2 => { email => [ @maintainers ] },
);

#!/usr/bin/env perl
use strict;
...
say "\$a_ref1 is $$a_ref1";
say "\$a_ref2 is $$a_ref2";
say "\$a_copy is $a_copy";

$a is original
$a_ref1 is original
...
$a_ref1 is altered
$a_ref2 is altered
$a_copy is original