However, this report https://www.bbc.co.uk/news/live/c5y8k7k6v1rt  says multiple websites and systems are done but, when I last looked, didn't mention Canva.

The point is that clouds, sky based or computer based, are not yours and can move or disappear though forces you can't see and have no control over.  This is why I always use computer based systems with perpetual licenses that do not need to check home to work. As it says on my A-Pub start screen:- 

Can someone check that it is still possible to use the online parts of Canva for work?

Even if it is still there, and unaffected, note that in 2025 there have been multiple major online system failures and hacks of major systems.  You should not depend on anything on-line for your work.  Certainly nothing you don't have backed up or copies of locally.