I'm not sure if this is the right place for the topic, but I thought it's worthwhile to come up with it somewhere.
I've looked around at MySensors and I have to say that the developers did a great job, it is obvious that they know what they are doing.
Unfortunately some of the users not so much. There are a lot of beginners who violate the corresponding regulations. Maybe it is not intentional, perhaps they don't even know that there are rules for the so called license-free bands, too.
For those who haven't heard about these yet:
I really don't want to be a party killer, but it is not as free as you think. There are both power and duty cycle limitations for each sub-band. You cannot transmit at +20dBm whenever and whatever you want because it is illegal, but most importantly because it can jam your fellow developers' devices in the neighbor or across the street. The licence-free frequencies are common and shared goodies. When you don't respect the regulations, you basically steal others share. Everybody should follow the rules in order the keep the bands usable.
Regulations in the EU
CEPT recommendation which is basically the same.