A majority of the small-ticket loans are given out under the umbrella called IGLs (Income Generating Loans), which is basically capital for asset development and/or small-time business building. (e.g. the spice shop woman in the article) These are the loans given out at 24%.
One of the issues is that a lot of borrowers take out IGLs and, once they have the cash in hand, end up spending it non-income generating activities, like weddings, or funerals, or baby births, or girl-child-attaining-puberty ceremonies.
There is another class of loans called ELs (Emergency Loans) that are interest-free, and meant for 'unforeseen emergencies' - typically critical medical treatment and funerals.
So yeah, when you take a loan at 24%, but spend the money on a 0%-loan-activity, problems abound.
There is a fairly large amount of education and training that has to take place amongst the local populace in terms of fiscal responsibility, and significant cultural obstacles to overcome to teach it to them.