People are getting the their pitchforks out but I think they are misunderstanding. Opensubtitles.ORG is being replaced by opensubtitles.COM. They just are stopping access to the ORG website. I have already migrated to the COM website for a while. And a 20 downloads/a day limit for free users is very reasonable.
Once you have everything set up with sonarr, radarr, Plex, etc… You will have your own Netflix with all the content you want. And with minimal input of your own. Everything is automated. New episodes will automatically download. Movies will download as soon as they are available in your desired quality. It IS worth it.
Nzbget is a downloader. Drunkenslug is a usenet indexer. You can’t configure an indexer in a downloader. You’re probably thinking about a usenet provider. Usenet providers need to be added in the configuration of your downloader.
A decent indexer costs money and a provider costs money.
To automate everything, you would want to take a look at Sonarr and Radarr.
Btw. I would recommend Sabnzbd over Nzbget anyway.
I use bazarr in combination with a vip membership of opensubtitles. I’ve been doing this for years since they have been adding ads in them for multiple years. Messages like “This subtitle was downloaded from” are also removed.