Ask HN: Does Email Open Rate not matter?

Since 2015 I have been receiving 1-2 (sometimes 3) emails per week from CodeTriage about my Github integration being broken. This has resulted in 718 emails to my gmail that I have not opened.

I was under the impression that companies that send many emails would track the open % rate and automatically unsubscribe users that weren't opening their emails in order to not hurt their reputation.

It looks like they've been using sendgrid since at least 2015. Wouldn't sendgrid step in at some point?