'If 20 million people use the same password manager and I have an exploit for it'
Someone is going to exploit my local password manager remotely?
Someone is going to exploit my local password manager remotely?
I don't know - who are you?
Even if you are not an especially valuable target, malware is pretty widespread. It steals credit card numbers and other data; if the attacker had a hack for a popular password manager, why wouldn't they go for it?