So in this brave new world, if someone manages to steal a single piece of my data (my private key) then they can have unfettered access to my phone, bank, email

So in this brave new world, if someone manages to steal a single piece of my data (my private key) then they can have unfettered access to my phone, bank, email and social media accounts? And none of those services have a customer support team who can restore my access and reverse the fraudulent transactions that were made in my name?