Singapore is as much of a tax heaven as Hong Kong is. When you live there, it's not.
Now if you re a chronically over spending under budgeted country and look at Singapore you're like "how can they be so rich with so little tax, they re robbing us", but that may hide a few things you could try on your side.
Does it really matter for 99% of us who are just working class people.
If Singapore can be a tax heaven and the profits are distributed more in the public sector i'm all for it.
As a Scandinavian, the idea of someone being "safe" from taxes is ... alien, to say the least. :)
[1] https://en.wikipedia.org/wiki/Tax_haven
[2] https://www.google.com/search?q=haven+dictionary