Are you running the container in rootless mode (perhaps via Podman)?

Rootless containers run on an emulated network stack (slirp4netns for podman, not sure about rootless docker), since the runtime doesn’t have the privilege to touch the real one - which is the point of running rootless.

This emulation uses a decent amount of memory and torrent clients in particular open a lot of connections. My slirp4netns process eats up several gigabytes whenever the torrent container is active.

Spotube.

Note that it’s not really a Spotify streaming app, rather it uses your (free) Spotify account for playlists, search, recommendations, etc. and then goes and find the song you want to play on YouTube, and the lyrics from scraping websites I think. Pretty clever.