In my opinion, micro earnings does not have to be for just BTC. mTurk pays its workers in cash, and being that mTurk is serviced by Amazon, the only way to really be "scammed" is a requester not accepting your hit, and as long as you follow the safety guidelines set forth by mTurk, you aren't as exposed to viruses, although it can still ostensibly happen, from not paying attention. Besides, the pay is in cents and dollars rather than microchange like satoshi and/or litoshi or even doge..