I only became aware of him after all the banning and people reposting things into short forms across everything of him and his brother, which to my knowledge turned out to be in part because their online course/site encourages doing that type of promotion like a pyramid scheme, people make money from doing that, and the algorithms - and googling - follows controversey.
If you take those many, many one minute clip of them floating around, you can find absolutely horrific things, you can find things that make no sense, you can find the flashy things with cars and lifestyle that some young people admire and dream of, you can find sensible things, same for most controversial figures. Each person who has come across that content can end up with an entirely different view on them so we need to be discussing what parts they find valuable, and teaching the discernment of how to take and leave from any source, rather than ensuring they don't agree with anything either of the Tate brothers says ever because if they go into those online spaces and they see a clip of him saying 'young men, you need to workout and make money and take responsibility' - things some of those important male role models may have been saying - they're going to be confused as to why they've been put into entirely bad. Putting people into these 'good' 'bad' categories isn't helping.
I have no strong opinion or worries about them as individuals anymore than anyone else who similarly has such a following. Their popularity is more a symptom of cultural conflict and backlash than causing it - there are dozens upon dozens of people out there discussing the same topics in different ways.
I do have concerns about primary teachers discussing the impact they're seeing in schools, that parents still let their kids who are not yet old enough to have that discernment out on the internet with far less precautions than anyone would reasonably expect in person - some parents are scared to let their kids outside on their own but happy to let them online that way. We still have parents that treat the internet as entirely entertainment or entirely separate to real life and think there are no real life ramifications and we have schools that equally treat the internet similarly and in my experience, many are very behind in internet safety.
I also think we as a society are failing young people in many ways, especially with technology and modern ideas around identity it's seen in this thread with people being put into demographic boxes that actually aren't that representative and anyone who is pushing back against that is going to cause sparks, but most will just as quickly fade, but those conversations really need to happen - it's just a question of how they can happen sensibly and until then it'll be through these online clips and weak school assemblies that do very little of any benefit.