even basic fullhd can pull several gigs per hour, per stream.

my adopted dad used to hit their old 8gb per month jetpak quota in one weekend just refreshing a local auction site (they don't stream or so much other than email and banking at home otherwise)

I watch stuff at 1080p but 1.5x-2x. A 1h video at that with 6kbps and 60fps can be quite consuming especially if a lot is happening. Have that on in the background for 8h plus doing other stuff (gotta pull docker images, or the blackhole that is npm) and you get over 10GB daily easily. Add a modern game or two a month and you're above 1TiB/month.

I only just recently UPGRADED to 1080. I spent the better part of the last decade only dealing in 720p.

My TV has been 1080 forever, I plan on upgrading to 4k for HDR, miniLED. I might try some 4k stuff 🤷‍♂️

Am I technogrouch for continuing to watch video at no more than 1080p?

I rarely watch any video. Video tutorials just aren't as informative to me, than if you read the exact same material. If it's a tutorial on something mechanical, where part x has to line up with part z, or the wheels fall off, sure.