An anonymous donor gifted them a large amount of Bitcoin on the condition that they must learn how to use Bitcoin and advocate for the use of Bitcoin:
> After meeting with several philanthropies in the region, all of which wanted to take the funds and convert them into fiat to cover the community's immediate needs, the donor partnered with Michael Peterson, a San-Diego native that spends up to 9 months of the year volunteering in El Zonte. Michael was given the opportunity to administer the Bitcoin on one condition - he would not cash it out. Beneficiaries of the digital currency had to learn how to use the Bitcoin itself, creating a Bitcoin economy
In other words, a wealthy Bitcoin holder gifted Bitcoin to one of the poorest towns he could find on the condition that they don't cash it out.
They basically forced a poor town to use Bitcoin in exchange for free Bitcoin and now try to use it as an organic success story.