You seem to defend the idea that 'limitations to free speech lead to dictatorships' by defining a dictatorship as 'any government that puts limitations on free speech'.

...which is obviously tautological.

For better data, check out the democracy index: https://en.wikipedia.org/wiki/Democracy_Index#Democracy_Inde.... It's compiled by the publisher of The Economist, which is trusted rather widely, and its methodology is public.