How is a private company going to issue and authenticate identity?

We have Apple ID, Google accounts, FB, Twitter, Amazon, Microsoft accounts, etc.

Are we going to replace Social Security numbers with a patchwork of different accounts from different companies?

Not even the most anti-govt, staunch libertarian has suggested that our identities be issued and managed by private enterprise.

If a new ID scheme develops to replace Social Security, it's going to come from govt, though maybe they'd consult with tech companies and data security experts to develop and deploy this new scheme.