Some good suggestions here and an interesting question to pose! Here are the running focused Youtube channels I subscribe to:
Road, Trail, Run - good reviews of shoes, sometimes the videos run longer than I'd like
the Ginger Runner - ultra/trail focus, inclusive, good equipment reviews, Pacific Northwest vibe
Total Running Productions - certainly helped compensate for lack of racing during COVID
The Running Channel - UK based, fairly basic training & life advice but some interesting topics
Seth James DeMoor - shoe review in his "Shoedio" very upbeat guy, likeable
Kofuzi - shoes, equipment, food/fuel reviews
Run Steep Get High - trail & ultra focus from his Southwest base
Bob & Brad - two physiotherapists who offer very useful advice about stretching & injuries