Probably because it’s illegal to use one without a license.
However, there’s nothing illegal about using the uv5r to receive. And in reality if you only use it on the pmr446 frequencies you’re very unlikely to get busted.
If you want something actually with decent capability then the Yaesu FT818 is a good bet. It does all amateur bands, UHF, VHF, airband, FM broadcast all modes. But it costs money.
I’m not an active ham anymore but I keep an 818 around.
As for why I’m not a ham anymore, spend some time with some hams and you will get the idea.
Also a former ham (age 14!).
Nearly all conversations:
"We read you loud and clear here. What kind of equipment are you using? Mine is blah blah blah. How do I sound? Ok, over and out."
That translates to "fear of china" which is almost always incorrectly applied. Were there a single word for "boycotting china" that would be more appropriate.
“Why would I buy a radio from communists. It’s probably bugged”
I facepalmed so hard I nearly imploded my skull on that.
If you just want to listen, a handheld scanner would be a far better option than a Baofeng (but of course cost a bit more).
Anyone who makes a habit of transmitting on a frequency they are not authorized on WILL be caught eventually, especially if they are interfering with police, emergency services, business users, and broadcasters. And all of these are very easy to do if you own a Boafeng and don't know how to use it.