Microfinancing is pretty secure its just like normal type of loaning to banks or other institutions.
Micro financing will surely help people in a developing country to cover up expenses for living,but this comes with a risk.Because the loans being offered here is for short term so for sure interest rate will be higher compared to a regular loan.Plus the thing that microfinancing or loaning is being offered to poor or unemployed they loan for a reason,they loan because they need it for a living,and when the time for payment comes most unemployed person will surely not be able to pay this off and the taxes will built up and the one who loaned it will be down to zero and to negative in terms of finance.Chances of lose will be higher for sure.
Many different concepts of this but for me it is important to know what is micro in some countries is still big in many. For example in my country microloan is the equivalent of 1 month salary, but converted to US dollars,,, it is only about $200 (less actually).
Then you bring it to a poorer economy, say like in a new country where $200 is 6 months salary, it does not even mean micro anymore.
So this crypto micro economy works because of fractions, in my mind. You can loan 1 ETH or you can loan 0.0005 ETH, does not matter.