Why would any big tech companies implement this? Just the idea that it would level the playing field makes it unattractive to them.
And if you don't run your own pod, you're still giving someone access to, not just some, but all of your data. They're likely to have similar provacy policies to everyone else which allows them to share it with partners and monitize it.
I see some advantages to Solid, but if the economics of having customers pay for services and keeping their data private in return were on par with using and monetizing your data, Google, Facebook, and their friends would have switched to it years ago. Instead what we see are a handful of companies like Proton taking this approach,and they are only used by people who REALLY privacy.
I appreciate that Solid exists, but it doesn't seem like it will have a significant impact on silicon valley nor the average person.