I get asked this often enough that I've stopped giving a quick answer, because the honest response is that I don't know. Not until I ask what you mean by it first.
This is the actual problem with the term.
I've heard "virtual family office" used to describe an accountant who convenes three advisors twice a year. I've heard it used for a wealth manager bundling tax and estate services under one retainer. I've heard it used for a genuine, well-built operating structure run by fractional specialists, where the family holds everything. Those are not variations on a theme. The first is a meeting. The last is a family office. They share a label and almost nothing else.
So when a family tells me they're weighing up a virtual family office, my first thought isn't whether it's a good idea. It's that they may not be comparing anything at all.