Generally a lot of them you can get an invite from someone on Reddit or discord. A lot also open up for a week or so allowing people to register every year or whenever a major tracker goes down so the refuges can join. you can check places like Reddit /r/opensignups.

A lot of mainstream stuff is ripped already, the “ratio” on some is more if you download a torrent, they want you to seed it for x amount of time or seed it back x amount to the community. I don’t know of any that expect you to be ripping and uploading that way, it’s recommended but a lot have groups for mainstream content.

There are a few “elitist” private trackers that require “interviews” and stuff, but don’t let that scare you off 99% of them are all just grab and invite or sign up and seed back to community for the week or so minimum (preferably longer) and your good to go!

>> How do you join private trackers from scratch?

https://old.reddit.com/r/trackers/wiki/how_to_get_started

Regarding seed ratio, generally by perma seeding. Many private sites either use seed time requirements instead of ratio or offer bonus points for seed time which can be exchanged for ratio. But also as new editions and formats are released, the library has a bit more turnaround than your music sites of yesteryear.

I was looking for this european movie from 10 years ago only last month, could not find it anywhere on line, streaming or torrent. I'm pretty confident there is still a lot of stuff missing.

hey there's a project idea: a "todo list" for rippers that scrapes imdb and checks what's not in pirate bay (and then looks for dvd's on ebay / libraries)

use their RSS feed + a seed box to automatically grab stuff as it’s posted some sites have ratio free for large files to get them seeded faster. at least that’s what I did a decade plus ago.