You'd probably get more mileage at complaining to DO than you would to GitLab.
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EDIT:
https://news.ycombinator.com/item?id=11529949
> @fweespee_ch: if they're not reading HN, they're doing it wrong anyway.
Fair enough. I just think trying to force a response out of GitLab employees is the wrong route to take when they have no power over the coupon.