Care workers on zero-hours contracts

It's interesting to learn from the current, and fully justified, campaign against the use of zero-hours contracts that thousands of care workers are on zero-hours contracts.

Could there, I wonder, possibly be any connection between this fact and the often-expressed view that the service provided by organisations that provide care for profit is not always acceptable?

(The many readers of this blog who aren't UK-based may not be aware of this controversy.   It is becoming clear that hundreds of thousands of people 'employed' in the UK, some of them by very well-known companies, are on 'zero-hours contracts'.  This means that they are not guaranteed any work and do not have the same employment rights as other workers.  Yet some of the companies actually forbid them to take any other employment while they are 'contracted'.)