This is roughly the equivalent of giving an American ~$42k. I think that amount of money would have a huge impact on people’s well being.
Note: I looked up Kenya’s per capital GDP which is ~$2k USD. Based on on the article stating they received $50 per month, than means the lump sum was 60% of the GDP. 60% of the US’s GDP per capita is ~$42k
But they gave them 2 years worth of funds, so you would double the number.