No, it used to be a thing but not anymore. I have a bunch of android 9 phones and I tried, while there are proof of concept exploits that in theory could allow me to gain root access to my own phones, due to “safety reasons” the security research community no longer provides working prototypes.

Which really means that they are only for sale on the exploit market which I, as an individual cannot even access, not that I could afford these intelligence agency tooling.

So my phones are technically no longer “safe” to use and I would have to buy new ones, but also I cannot jailbreak them to use them for something else (in my case, as a simple wireless camera)

There are a few phones, less than 1% of all phones, which the manufacturer will allow you to unlock the bootloader and obtain root privileges. This privilege often costs 1000$-1500$ for what is the performance of a 300$ phone.

But that is not a jailbreak, that is an permitted privilege granted by to you by the manufacturer.

Of course, since almost no one can access root on their phones, the development of any non-sanctioned software has slowed to a crawl with most android rom projects dying outright.

So the point of my comment is that this dynamic will be slowly made the norm for the Personal Computer.