Taking this question at face value --- HN makes "new" accounts green for a few weeks. This presumably would make a flood of new accounts created to support some particular opinion or post more obviously manipulative (although I've never seen that occur here).

Yeah there was no snark involved in the question. It was weird that it was turbo green.

I forgot this is stack overflow.

Hah. I always wondered why it was green. I always thought it was flagged or something.

That’s classified.

There's a search box at the bottom of most pages, and typing "green username" into it will answer your question.

Cease your investigations.

Why do you need to know?

Who are you?

What is your method of proof for these?