What is above all may be freely used and that indeed happens, the disadvantage is that it can be very busy and you may suffer for example from other teams or baby monitors. Many teams will, therefore, choose to do other things that are probably not entirely legal.
Where people often do not realize is that some violations of the law may have significant consequences, fines of € 45,000 per violation are no exception in illegal frequency use and takes you there possibly people with compromised because example, traffic, emergency services and commercial services can interfere with it. In the Netherlands Radiocommunications Agency monitors operating in violation and they are extensive plants that they can rapidly detect when you start sending with all its consequences. Here are some things I’ve come across who are not allowed to:
Using equipment that does not meet the conditions. It’s officially not allowed, for example, to use the most famous Baofeng radios on the PMR and LPD which often in the best plate carrier channels since they strongly broadcast in many cases (1 watt at least, that’s 100 times more than 10mW you may use on the released LPD section or 2x the max. of 500mw on the PMR channels).