5 months ago Alex Jones was extreme. In this last round, Eli the computer guy was considered too extreme.
For problems of manipulation, I suggest the solution is not a politician or company getting to choose who gets to manipulate, but rather, becoming more resilient against manipulation.
If you're suggesting Google should be prevented from moderating content that doesn't meet a strict definition of legal harm... fair enough, but there's nothing stopping laws from being passed which would justify Google's policies.
Would it be okay to substitute "Five 9s of uptime" in an SLA with "solid uptime" and call it good?
Well, advocating for genocide on Muslims, spreading deadly propaganda such as antivaxx or "great replacement" or such certainly qualifies as "extremism".
What's "extreme"? Is two men wanting to marry each other extreme? Is advocating for freedom of abortion extreme? Is criticizing the ruling national party extreme? Is saying that climate change is influenced by human actions extreme? Is exposing instances of 'bad apple' abuses of power extreme? There are a lot of people who will answer yes to all of those, in the US alone. ("Of course we believe in freedom of speech, but certainly extremism should be censored!")
I suggest not handing totalitarian censorship tools like the vague "extremism" to politicians and companies.