Why do you believe that?
Most Gen Z people I've talked to through work or my private life have expressed similar sentiments; Things aren't going to get better under the current systems and politicians largely seem focused on maintaining a status quo. Is it because it's a struggle to do anything due to Republicans? Yes! Democrats don't take advantage of that enough to put it in everyone's face, though. To use the TikTok thing as an example, a lot of individuals see that one of the few pieces of legislation that's being passed without any trouble is the one that's seeking to make their lives worse.
COVID fucked them over in an entirely different way. Their social structures collapsed on them during what every single piece of media considered "the best time of your life". I could be missing some interview snippets but it largely looks like young people spitting out facts that their lives are not good and they feel useless/hopeless.
Oftentimes, what I see from millenials these days (and what we saw with Gen Z, and Boomers, etc, etc) is that we hit a certain age and begin downplaying the concerns of the younger people. Citing things like, "They don't vote, they get mad when things don't go their way, they should get more involved." But then you don't see people trying to court the younger generations. We saw it with Obama and it worked! Up through 2008 young people were a MASSIVE voting bloc for Democrats. Regardless of his track record, he inspired enough young people to use their vote in a meaningful way.
It's insulting to downplay the woes of younger people as "lacking perspective". It's what Boomers say whenever they're feeling entitled on any given hour.
Then you have shit like how Bernie was kneecapped by the Democrating establishment, when Bernie was saying the kind of things that hits the head of what people are currently facing; Idiotic rent, the CEO class lacking any responsibility, and general support structures failing. Why wouldn't you be cynical and apathetic at that point?