Well, I mean, except property rights and the people that will defend them in most of the places in the planet suitable for human habitation.
And the above presumes the existing population would accept you, and it's quite likely they won't.
Deciding to live off the land without special privileges enjoyed by native populations is simply not possible; regular financial transactions between you and society is a requirement, and it's pretty much impossible to raise children without access to modernities and without having the authorities go after you for child abuse.
I love eating wild weeds and berries, but it takes _a lot_ of time to get enough to fill yourself, and it's not a case that people have only eaten stuff like acorns only in times of famine.
This fact by itself made me question a lot of what's in "Sapiens".
Also from what i gather most meat was aquired from trapping, rather than hunting
They tend not to be very wealthy by modern standards. Maybe you could ingratiate yourself to them with them gifts of things that require modern manufacturing infrastructure.
You were born into the tribe, and stayed there your entire life. Also there were no laws on hunting, setting traps, etc.