How is "squatting" .dev meaningfully different from having .dev.com?
People here give way too much importance to TLDs.
People here give way too much importance to TLDs.
test-service-1.zeus.barrera.io dummy-server.zeus.barrera.i
Etc. No need to create new (possible conflicting, definitely not future proof) TLDs.
my-test-thing-a.dev 127.0.0.1
my-test-thing-b.dev 127.0.0.1
my-test-thing-c.dev 127.0.0.1
Buying an actual registered domain for that sounds like it would be even more confusing than using an unregistered TLD because it makes it hard to tell which hostnames are expected to work across machines and which are strictly "works on my machine".