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They call them more secure because the whole TLD is on the HSTS preload list, so no downgrade attacks.

Which means that an SSL certificate is required

It’s the same every year. I’m sure they could raise the price later on, but if you’re that worried, you can extend your registration to 10 years for 10x the one-year price. And if they do end up raising the price, you can also transfer your domain away.

I think all domains under `dev` have HSTS turned on.