Spodman,
Of course you can get it from the internet but who else is using the same setting?
The VFR pilot can legally access several sources for a QNH and all of them can be different - and as earlier reported they are regularly up to 5mbs different or even more when crossing a front
The souce is not the issue. It is the quality of the info and the random way a VFR pilot can legally apply it.
Regards