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By "site", are you referring to the actual site, or the EV indicator? Because the site itself doesn't look anything like Stripe's[1].

The Tweet shows part of the site as identical to Stripe's: https://twitter.com/iangcarroll/status/940281927789146112

I think the current look was updated later.

It was screenshots taken for the purposes of demonstration and wasn't his publicly hosted site. Do you think that he'd take that kind of risk?

What kind of risk?