I don't think so although it must be behind some of the claims. All bar one burst pipe I've attended has been in copper.
I think it's more a matter of people not looking after their houses properly, for example not having a small drip attended to and then they realise after a few months that it's caused much more damage. Doesn't matter, that's why we have insurance.
The pipes in our house aren't lagged but in the last two winters we made sure the loft didn't go below freezing. (We opened the hatch for a month or so.) I think many people last winter didn't take the extreme low temperatures we had. In the past the sun the next day has warmed up rooves (roofs?) so any ice forming within the pipework melted. Last winter any ice couldn't thaw out during the day unless the heating was on but many turned their heating off during the day to save money.
I've also found customers complaining to me when I spot potential danger areas. The worst was when I went to attend an electric shower. Although not GasSafe I spotted a gas boiler in a loft that was leaking and asked tenant about it. They gave a small history of problems (including last winter). I phoned the landlord about the shower and when I started talking about the boiler he launched a sidewinder before I'd got anywhere. (Walked out of the whole job in the end).
There's a huge culture of "Oh, the insurance will pay", "The state gives benefits" and so on. The personal responsibility (and, in this case, thinking about potential problems in your own home) has left many people these days.