Risk of using public trackers

I have sonarr, radarr, gluetun and qbittorrent with overseer allowing my family to request movies and automatically download. I only have public indexers in prowlarr (1337x, kickass torrents, etc.)

This NAS also has a lot of important data like photos and documents.

I am used to vetting my torrents pretty thoroughly before downloading but now it's all automatic.

What level of risk am I running with my data when downloading things in this manner? Is there a chance of malware getting onto my NAS? Ransomware? Is the risk pretty minimal?