Nah drunkenslug is an indexer. You need both an indexer and provider to use usenet. Indexers normally cost money via a donation for lifetime or 1 year of download privilege.
Providers you pay for via different plan types. Some sell “block” accounts where you get XGB of download and once it’s gone it’s gone. Some have a subscription model with a bandwidth allotment. Some have pay a flat fee for unlimited access. All depends on what you’re willing to pay.
R/usenetproviders has a wiki but I recommend Eweka or NewsDemon