This is only true of typical UK-style roundabouts which are designed for motor vehicle throughput.

It’s extremely common in the Netherlands to replace crossroads and T-junctions with roundabouts to improve safety, but Dutch urban roundabouts are designed with safety as the main priority. This is achieved through single lanes, sharp entries, limiting forward visibility, and pedestrian and cyclist priority (via what are effective zebras).

For more information see eg: https://bicycledutch.wordpress.com/2015/10/13/explaining-the...

(Edit: fixed wrong link)