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That's why the osmo-fl2k page has the following text:

"Before transmitting any signals with an FL2000 device, it is strongly suggested that you check the resulting spectrum with a spectrum analyzer, and apply proper filtering to suppress any but the desired transmit frequency.

Operating a transmitter with the unfiltered FL2000 DAC output attached to an antenna outside a RF shielding chamber is dangerous. Don't do it!"

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A radio amature most likely can't construct a bandpass filter with a high enough Q to filter out all of the spurs while still getting a usable signal. Releasing a tool like this and handwaving away interfearence concerns with an abstract refrence to 'proper filtering' is still iresponsible.

Dangerous? Are we talking RF burns here?

As in potentially disruptive to critical-to-life public safety systems, e.g. air traffic control, emergency services communications, I suppose.

Square waves = theoretically infinite harmonics at positive multiples of the fundamental frequency (in practice reducing with order of the harmonic)

Then there's in-band spurs / spurious emissions, different from harmonics.

I think we're talking jail time here.

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