It really depends on what you consider cyberbullying.
First of all, I'd like to make a difference between harassment and bullying: anyone can harass you, but bullying has the implication of some kind of social hierarchy that forces you to deal with the person.
A coworker or a fellow student can bully you because you have to coexist in the same space with them. A boss or a teacher can bully you, not only for the previous reasons but because the power dynamics are skewed their way (at least in theory).
So, I'd say a random person in the Internet can only bully you if it's like, a professional account or email. Something you need to use - or is inextricably tied to your image as a person - and often can't just block or tell the person to screw themselves because your corporate overlords wouldn't like any perception of being "unfriendly".
And that social dynamic is what makes bullying worse than plain harassment, in my opinion. If say @annoying_twitter_ahole flames me I can block them, and move on with my day. If they persist and start making a targeted effort with sockpuppets or brigading, in the worst case scenario I can always just delete the account, maybe start over with a different one if I really want to use the service.
Not to say, of course, that harassment isn't a problem. Of course it is, and specially in the anonymized environment of the internet where people will just whip out death threats for the most trivial of things. It's still wrong, needs to be addressed, and platforms should start to take a firmer stance on this.
I think this is fundamentally part of the problem with how the discussion of cyberbullying goes: there is a problem, but it's usually framed in the wrong way and then it starts to get criticized.
You don't really hear about the social media manager that has to deal with a giant load of unsolicited furry porn on their posts (rip Tony the Tiger) and is desperately trying to do some damage control, or about the tech support that is being (metaphorically) screamed at an angry customer for reasons that are no fault of their own, or the small businesses that are being tanked in the reviews for a meme (thanks, Steven Universe) or because the experience wasn't absolutely perfect for one customer.
At most you'll hear about the youtuber or internet personality receiving death threats because they're being canceled. Which is absolutely shitty but not really something most people relate to.
To compound that, you often hear about cyberbullying in a very "why won't someone please think of the children?" context which is usually very meh since 1) children's access to the Internet should be monitored by the parents anyways - it's not a child friendly place and likely will never be -, 2) outside of a school email - which is, in my experience, not so common for children - they don't really have any account that they must have, so they always have the option to just stop using it (or the parents have the option to intervene and prevent them from participating in the toxic behavior), 3) when it does happens, is often an extension of physical bullying so cyberbullying is really more of a symptom than the problem per se.
