I have to say after reading most of this weird cm-bashing thread, that I would never and have never mn'd while minding. Personally I don't have the time, but I think the cms who do use it before mindees arrive to swap notes, support etc, which can be invaluable in this job.
The only times I go on-line are if its to print stuff off for kids, or one-off neccessities like today, at half five, mindee and my three dc all eating dinner together, I put laptop on to buy something essential on ebay ! essential for cm;ing that is.
Although I see no need to justify this to th op who obviously hates cms for some reason !
In their defence and mine, all if the cms I know do a better job than they are ever appreciated for - so much of what we dois simply unknown and unpraised. With eyfs we are running a mini nursery in our homes, |IMO a much harder job than nurseries have,
Sorry rant over, just had to join in !