For image registry...probably not that much. But it is quite common for other software, often those that target containers/k8s/... I already have few of those and that would be quite handy to have some good local s3.

Concur - as noted in a sibling comment, I'm using both on Nomad/docker 5-node clusters, but started with minio then ran up garage-dev to compare (I just haven't migrated data over from minio yet).

I use mine primarily for long-term stores for Grafana's Mimir and Loki products.

Anyway, minio & garage are both lightweight, and happily run in docker, so if you've got a small cluster at home it would take maybe an hour or two to install them both from scratch.