Selection bias. There are many people dying despite being vaccinated with 2 or 3 doses, but they just don't make fun stories for liberals.

Presumably, if your claim were accurate and such deaths were occurring on anywhere near the same scale, then the internet would be flooded with those stories. But it's not, and there are no statistics to back up the scale you're implying.

Rapid growth means absolutely nothing on Reddit when it's possibly the most the most astro-turfed platform on the internet. I came across a thread from that subreddit and it resembled a grotesque celebration that a 4-year old had died due to an anti-vax family member.

The sub’s content is based on actual examples of vocally unvaccinated people dying. Unfortunately, there has been an endless supply of new content. That’s not the result of astroturfing. It’s the result of large numbers of people refusing the vaccine and ending up in the hospital for weeks, often dying.

Frankly, the sub has probably saved lives by convincing some folks to go get vaccinated. My own parents refused to get vaccinated until my dad’s unvaccinated cousin got COVID and was dead within a week.

I can't find the example you're referring to. Feel free to link to it.