If you earn/get big enough to care about it, then you would in the first place. Most software piracy busting methods revolves around existence of a snitch who knows you’re pirating. You definitely can get away with it if you’re just pirating it yourself, but a corporation with like 100 workers cannot do it when all it takes is one person to get busted.
On sound effects / samples it depends on how many people see it, so you don’t need to worry too much unless you get popular similarly.
Note that on softer cheese, both of these would be same. If you see outer spores, that means they’ve grown too much on its inside and made mycel webs enough to contaminate it.
If you’re not doing stuff with them; not much point.
Since these devices have ARM processors, they can be embedded to places that doesn’t need high power and contain smaller volume; unlike PCs. You can host your a Jellyfin server on one, host a pi-hole so that you filter out every internet traffic from ads on another. Maybe a small FTP server that you can use as cloud storage?
Look up compression methods, work out which would work best for your needs. Maybe re-encode your video files with H.265 which offers lower filesize for similar quality, or decrease the frame rate of the video files.
Private Trackers are solid options if you’re looking for some data in a specific niche that public trackers don’t offer quite well. Their signups are controlled by admins which makes harder for media companies to go in and send cease letters to torrenters. This does not mean they can’t however.
On a public tracker, anyone can be part of the seeding chain without any authentication; meaning they can monitor who’s torrenting what pretty easily. However for each private tracker, there has to be a seperate infiltration. Combining limited signups and being invite only makes hunting for them difficult.
To find them, you’re gonna either look at tracker forums’ open signup threads as a beginner; or if you know people that could have access to these trackers ask them for invite. Most private trackers have strict seeding rules, so seed them according to their rules.