Probably should have the Discord tags of the owners for the invite-only PUG servers, as long as they consent to their Discord tag being shared. I will only share the invite links of some servers.
Also should add whether the server allows RGL banned players are not. Really important as quite a few of the active ones allow RGL banned players

NA 6s Pugs (unless otherwise stated)
Drift Pugs, Inactive (likely dead due to Jamillia getting perma'd);
Hoboleague, Dead (moved to All Pugs): https://discord.gg/4gpH739T2z
Dr Pepper Pugs, Inactive (owned by RainOfLight)
Mushroom Mann Pugs (NC-AM pugs), Dead (owned by MushroomMann)
scientist pugs, Dead (owned by Miperton)
Gem Pugs, Unknown Status (Default role cannot see anything, unknown owner): https://discord.gg/etewuHk
Deafened pugs, Is It Really Dead If It Never Lived, (owned by deafened)
Testco.TF, Dead (owned by Muddy), invites disabled; ran 6s with experimental maps
TF2Maps Competitive, Dead (sweglord227 is admin, unknown owner), https://discord.gg/EPQR4T6YgP (6s with experimental maps)
kitten pugs, Dead (owned by cron, killed after drama)
Resurrection Pugs, Is It Really Dead If It Never Lived, (owned by rainbow)
Ice Cream Pugs, Dead (owned by ooga booga)
LeCrumble Pugs, Dead (owned by LeCrum)

Also Shadow Wizard only allows AM-IM players

HL/Alt:
_realistic_worm_..., Unknown Status (owned by the smoke); another Passtime pug server
HLMixes, Dead (owned by NikolaNido): https://discord.gg/kudjAXD
Ultiduo City Pugs, Dead (owned by Cloud): https://discord.gg/duRxjaufPA
The Spooky Orchestra, Inactive (owned by Des1_): https://discord.gg/fbaFu8DzMd (partnered with Pottsfield HL pugs)
Summit Ultiduo, Dead (owned by Adwill): https://discord.gg/GMgQ8cVQJz (unable to do anything in server)
4s Passtime League, Active (owned by weeabruh): https://discord.gg/QNYUBC3RdQ
Red Pugs, Dead (owned by Davidredface): https://discord.gg/78cw3sGgbY (HL)

That's all I got. Cool that you made this list.

not sure i get the point of locking one thread but not the other
edit: nvm

Sorry to bump this again, but I have to shill this:

https://github.com/jooonior/tf2-loadouts-script

It requires a bit more configuration than just a single bind, but it makes it to where it's one resup bind that works for all classes and remembers your current loadout.

Is it a mistake that it's koth_bagel_b5 and not koth_bagel_rc5? RC5 is the most recent version

One Time Pugs: https://discord.gg/5rYf5k5gZQ

super active; have players ranging from AM to Invite but as far as ive seen recent pugs there have skewed higher in skill. you won't get kicked for being bad. no rgl verification required or elo system too lol

Hoboleague: https://discord.gg/4gpH739T2z

seems relatively active; never played pugs there though so. they also ping literally all the time

however i generally recommend doing TF2CC unless you're pug banned from there. higher quality pugs but they run way less compared to the two servers i linked

any plans to fix or just gonna leave them as is?

as far as i can tell, that list is a bit inaccurate. i followed the steps you described to change the crosshair, and it was working as i expected up until i got to the Flying Guillotine (aka supposedly tf_weapon_cleaver.txt). changing the crosshair in this file does not affect the cleaver.
i asked about this in the huds.tf discord, and was notified by quickkennedy (author of cutehud and quakehud) that "[some] weapons oddly won't take their crosshairs from their file."

after experimenting, i learned that the Flying Guillotine takes its crosshair from tf_weapon_jar.txt.
it appears the list is in dire need of an update. github shows the last time it was updated was 2018