The positive I see in the so-called gig economy is far more flexibility in employing underutilised labour. If government increases the transaction costs of employing underutilised labour, then it will probably stop employing underutilised labour. It could easily be a net negative.
If there's an efficient way of working it out - i.e. keeping the transaction costs low - I'm not against regulating Uber as an employer. But it is a different form of working, and it's the kind of working that connected communication technology is best positioned to enable. It would be best if we didn't crush it under an assumption of regular employment.