Condensation causes mould, but it isn't what's technically called 'damp' so council/landlords can blame the problem on lifestyle. Ie. drying clothes indoors, not opening windows enough etc.
When it's generally a lack of ventilation and insulation in the property. Which will cost them more than they can recoup in rent increases so they don't do it.
If you have the resources to find out how best to deal with condensation issues, the cure doesn't help either, opening windows and keeping the heating on does help but bumps the heating bill up hugely. Less money to spend on other essentials.
Our last house had some pretty bad mould problems. We have the jammiest luck that allowed us to move to somewhere healthy and affordable.
We would have been looking at a 50% increase in rent if we hadn't have dropped on.
The neighbours had lived with worse condensation and mould problems for nine years before they managed to get a council place.
And just that one aspect of living with limited means is utterly miserable.