How many products are there where privacy is a core part of why it’s successful?

I’m leaving scale of “success” ambiguous so I get more answers.

Working on building zkTLS infra/products. A ruthless empiricist and meme connoisseur.

http://opacity.network

I think privacy is being overrated as a necessary feature to own market share; however, it's necessary as a feature to own the largest market share of those that judiciously care about privacy.

google vs duckduckgo
gmail vs protonmail
wallet to wallet vs tonadocash