Burning the library of alexandria probably destroyed a smaller percent of roman historical data than Amazon's e-book DRM is going to for future generations.
We do not have a single digital preservation format with a proven track record of surviving fifty years, let alone a hundred. Microchip fab depends on supply chains and trade secrets with a thousand failure points.
The Internet Archive is great, yay cheap terabyte backup disks, but you can't blacksmith a USB-3 interface.