Hackers don't bother cracking denuvo games because each game has a specific key that lock each game, cracking denuvo requires either breaking the very security system itself, or cracking the passcode for lack of a better word, for each game, it's easier to crack the passcode but boring, and cracking the security has it's own problems as they can update the system to close that with the next revision, both methods are boring but well within doable..
Switch 2 likely uses a hypervisor protected encryption and not a game specific one (it would be VERY difficult to do so, not to mention that it would not be doable on a system wide scale for each game as the denuvo license is licensor specific), meaning the likely scenario is that the switch 2 if it has denuvo encryption, is encryption at the hardware level, if that is the case it will be cracked likely within a year, like i said, this won't matter as much as people might think for emulation though, emulation can happen even without a cracked switch but it's harder.
As for why more games on pc aren't cracked, it's due to lack of interest, 90% of the games that are on the list either get it removed eventually (the biggest deterrent to denuvo cracking ironically) or have multiplayer components making cracking it pointless, the exception to this is SEGA games, which surprise surprise, most end up on the switch, which means you can emulate them, there are also key bypasses which work for this function too, but i'm not as experienced on that.
For what it's worth someone is supposedly working on a universal denuvo cracker since the switch is on the way out, but cracking denuvo is still pretty low priority for the time being for the reasons i posted above, though interest has started growing again.
As i said, the main problem is the lack of a desire to, the desire is growing with recent developments but it's hard to say how many care enough to do it, it is doable though.