Here's a list of YouTube channels that are (primarily) dedicated to slinging.  If you know of another channel that should be added, leave a reply or send me a private message with the link.

Acroballistics - https://www.youtube.com/@Acroballistics
Andrew Moore - https://www.youtube.com/@andrewmoore135
Archaic Arms - https://www.youtube.com/@Archaic-Arms
asgesa2 - https://www.youtube.com/@asgesa2
AurelioApe - https://www.youtube.com/@AurelioApe
Александр Кржешовский - https://www.youtube.com/@krgesh
Blind Squirrel RockChucker - https://www.youtube.com/@blindsquirrelRockChucker
curiousaardvark - https://www.youtube.com/@curiousaardvark
Dan Slinger - https://www.youtube.com/@dan_slinger
David Morningstar - https://www.youtube.com/@davidmorningstar
David the Shepherd - https://www.youtube.com/@DavidtheShepherd
elvisibz - https://www.youtube.com/@elvisibz
fonermenorqui - https://www.youtube.com/@fonermenorqui
Funditor Uwe - https://www.youtube.com/@Hubert2899
gaulix69 - https://www.youtube.com/@gaulix69
HaifischKuchen - https://www.youtube.com/@HaifischKuchen
I am strong onoff - https://www.youtube.com/@Iam_Strongonoff
IronGoober - https://www.youtube.com/@IronGoober
Jesse Kyle - https://www.youtube.com/@JKyleSchroeder
jlasud - https://www.youtube.com/@jlasud
joe_meadmaker - https://www.youtube.com/@joe_meadmaker
JudoP - https://www.youtube.com/@JudoP_slinging
Kick Slinging - https://www.youtube.com/@kickslinging
Kinetic Slinger - https://www.youtube.com/@sirchanesaw
Mark Harrop - https://www.youtube.com/@sputnik225
Mersa - https://www.youtube.com/@MitchMersa
MrJaegoor - https://www.youtube.com/@MrJaegoor
MrJugas - https://www.youtube.com/@MrJugas
parkway mar - https://www.youtube.com/@parkwaymar7605
PavirryPe - https://www.youtube.com/@PavirryPe
Practical Paracord - https://www.youtube.com/@PracticalParacord
Procarz Polski - https://www.youtube.com/@procarzpolski1216
Primitive Sniper - https://www.youtube.com/@Ratd0g28
Primitive Technology Sling - https://www.youtube.com/@primitivetechnologysling5420
Rafael Sabater - https://www.youtube.com/@rafaelsabater1571
Raúl Lopera García - https://www.youtube.com/@raulloperagarcia7929
Road Dog - https://www.youtube.com/@roaddog7080
S'Clasher - https://www.youtube.com/@sclasher1345
Sling Moustachio - https://www.youtube.com/@slingmoustachio4990
slingnstones - https://www.youtube.com/@slingnstones
Slings vs the world - https://www.youtube.com/@slingsvstheworld2866
SPOOKYSLINGER - https://www.youtube.com/@SPOOKYSLINGER
Sport Teleport - https://www.youtube.com/@Snowsergei
Teg - https://www.youtube.com/@teg828
TheTiDman - https://www.youtube.com/@TheTiDman
Timpa Linkosling - https://www.youtube.com/@TimpaLinkosling
Tomas Iwanyckyj - https://www.youtube.com/@tomasiwanyckyj9999
Tyler Danger - https://www.youtube.com/@tylerdanger1484
WeaponResearch - https://www.youtube.com/@newworldmartialartist7245
2Jotas - https://www.youtube.com/@2Jtas