The youtube comments can be a very toxic place but if you know where to look there are also very wholesome communities.
LGR is cozy and just a joy to watch for his laid-back passion. His community follows this mindset.
Most science youtubers have pretty chill comment sections. Same with makers, coffeetubers etc.
Gaming and influencer comments tend to be a shitshow. Obviously.
Nigahiga had chill comment section even with huge following back then. Of course there were negative things on the chat but his whole operations had ‘avoid controversy as much as possible’ philosophy which made his community generally chill.
Vsauce!
Eric Rosen and Tom Scott
None of my other subscribed YouTubers/communities compare, imo!