Mrs Bloggs, or indeed 99% of the population, hasn't heard of geeksplit.com or trainnarg.com or any of those umpteen websites. She has, however, heard of Virgin.
Your point noted and I see mine wasn't particularly well-made

The thrust of my point was that this app, and the existing ticket splitting sites, are fine for those members of the population who have mobile internet access and understand those sites and/or the app.
For those members of the population who don't have that internet access, and/or don't understand those sites and the app, it's going to make precious little difference. And as I see it at the moment (and as I said earlier) I struggle to see what benefits it is likely to bring to the intending passenger (especially a casual one who uses trains irregularly) who turns up at an unstaffed station and have to negotiate a
TVM▸ with its (usually) limited range of products.
Plus of course the idea is currently only being promoted by Virgin. Whether or not other
TOCs▸ will jump on the same bandwagon, if indeed Virgin get it up and running in the first place, still remains to be seen.