i think most others covered it but for provider Frugal usenet is probably best bang for your buck as you get access to two separate systems.

there are plenty of newshosting resellers that use the same exact servers that are much cheaper than $15 a month or even $10 a month. use one of the backbone maps to see all of the various ones.

i dont think any service is going to give you free weeks or a month with no strings attached. if they did everybody would use them and not pay. you can just buy 1 unlimited month of frugal usenet for 5 bucks (not a subscription) and call it good.

Here is a good list of active groups, i am sure there are more. of course plenty of binary groups are active to. if one you like isnt that active, why not try to revive it?

alt.culture.usenet:
alt.fan.usenet:
alt.obituaries:
alt.privacy:
alt.tv.simpsons:
ba.broadcast:
comp.ai:
comp.arch:
comp.compilers:
comp.dcom.telecom:
comp.infosystems.gemini:
comp.infosystems.gopher:
comp.lang.c++:
comp.lang.c:
comp.lang.forth:
comp.lang.misc:
comp.lang.python.announce:
comp.lang.python:
comp.lang.raspberry-pi:
comp.lang.tcl:
comp.misc:
comp.mobile.android:
comp.mobile.misc:
comp.os.cpm:
comp.os.linux.announce:
comp.os.linux.misc:
comp.risks:
comp.sys.apple2:
comp.sys.ibm.pc.games.action:
comp.text.tex:
comp.unix.shell:
gnu.emacs.help:
misc.legal.moderated:
misc.taxes.moderated:
news.admin.moderation:
news.announce.important:
news.announce.newgroups:
news.groups.proposals:
news.groups:
news.software.readers:
rec.arts.drwho:
rec.arts.movies.current-films:
rec.arts.sf.tv:
rec.arts.sf.written:
rec.autos.sport.f1:
rec.aviation.soaring:
rec.bicycles.tech:
rec.food.cooking:
rec.games.backgammon:
rec.music.beatles:
rec.music.classical.recordings:
rec.radio.amateur.antenna:
rec.radio.amateur.boatanchors:
rec.radio.amateur.equipment:
rec.radio.amateur.homebrew:
rec.radio.amateur.misc:
rec.radio.amateur.moderated:
rec.radio.amateur.policy:
rec.radio.amateur.space:
rec.radio.info:
rec.radio.shortwave:
rec.sport.rowing:
rec.woodworking:
sci.astro:
sci.electronics.design:
sci.electronics.repair:
sci.logic:
sci.physics.relativity:
sci.physics.research:
talk.origins:
uk.comp.sys.mac:
uk.radio.amateur.moderated:
uk.rec.sheds:
uk.sci.weather:

i can understand that about crypto. Fwiw, this discussion was posted recently about usenet and crypto, https://lemmy.dbzer0.com/post/2612428 Others take crypto and several of the ones mentioned take it directly without a processor and have better perf. than the newsdemon system.

the older stuff on newsdemon is hit or miss anyways cause of the way they handle their storage so it will be hard to know if its gone cause they suck or gone cause of takedown.

if the post is from 2 years ago ntd or dmca is not going to make a difference. it will be long gone regardless.

they all have copyright removals. nothing special about eweka in that regard. might take an extra day or two but still the same problems. if you are even remotely close to automated it wont matter who you use.

usenet, just get an unlimited plan not a block account.

BTC you would "probably" be okay but if you are going full anon i think Monero is the only true anon. im not really into crypto so i dont know how true that is, I just see that mentioned a lot that Monero / XMR is a privacy coin. Cash is king though. Maybe the most annon? frugal usenet and Blocknews actually have a cash payment option on the website at checkout, if you are worried maybe ask them the track record for receiving it. If you are doing VPN to, Mullvad takes cash but you do not need vpn for usenet.

Frugal Usenet vote from me. It has multiple backbones so make sure you set it up correctly in your newsreader (server priorities). there is no provider that doesnt have takedowns. it happens to them all. best to look for reposts if you can.