Not as poor countries, but as poorer countries than the ones the parent comment mentioned. The GDP per capita of Saudi Arabia is around $23k - approximately half of that of Sweden, the Netherlands, or the UK.
Qatar is absurdly rich, but the wealth is inequitably distributed (unusually so). Although the GDP per capita is ~60k, the median household income (and the median per-capita income) are considerably lower than the countries the parent comment mentioned.
> The GDP per capita of Saudi Arabia is around $23k - approximately half of that of Sweden
Why are you mentioning nominal GDP, not PPP which is $55 grand according to CIA (which is more than Sweden's and UK's and just a bit less than US's)? If they raise their taxes to the level of Sweden they will have larger nominal GDP although without any increase in the purchasing power.
Qatar is absurdly rich, but the wealth is inequitably distributed (unusually so). Although the GDP per capita is ~60k, the median household income (and the median per-capita income) are considerably lower than the countries the parent comment mentioned.