SaaS rots faster than the bits on your spinning rust. The incentive structure tends to drift away from a corp's long-term strategy. If you don't own it, you don't own it.
Even the bits you own rot faster than brick and mortar. It's just the nature of the universe - cosmic rays, magnetosphere, etc. Doesn't help that the integrated circuits are smaller, and hence much more brittle with each generation.
And do you even own the hardware you purchased? Even before the ongoing craze to turn fridges into subscriptions into landfill. Try some "retro" devices from 15, 20, 30y ago - many builtin websites/apps/services just 404, long before companies planned for obsolescence.
Only diamonds are forever.