Tax attack on drivers of taxis?

Why do taxi drivers and uber drivers have less rights than other Australians ? Unlike the rest of the Australian population we have to collect, administer and send off GST payments even though most of us earn way under the 75.000 ceiling amount. To me and any fair minded person this is a civil liberty issue. Why are we treated differently than every other Australian. I would love to have your opinion on this issue. – Spencer Turner