Lord_Kane: we hope that they do, you never know, I don't trust any electronic system enough to ever store my info on there, its just a matter of when, not if a system will get hacked, so I am always ready to challenge any odd charges or changes to personal information, sadly 2020 has reinforced this paranoia.
This. This is coming from someone who works on web services for a living.
Where I live, the Desjardins financial group (almost an institutional player in banking here) go an info leak (the banking info, phone number, SIN... the works, for 4.2 millions users which is roughly half the population of my province). In this incident, the flaw was human, not technical, but you have that to consider as well.
Some big almost institutional players (ex: AWS, Digital Ocean, etc) take security very seriously. Among the small and medium-sized companies, its a total joke (I've been around, in a lot of places I've been, I was either the most or among the most security-minded developers in the place and I'm not a security specialist... security is one, admittedly the most important one, concern among many that I have to take into consideration).
Whatever personal info they require beyond what they strictly need to operate is sheer irresponsibility on their part. If anybody serious wants their data, they will be hard-pressed to keep it secure. Don't assume you'll have privacy or security for most things on the internet. Always make the mental calculus of the worse thing that could happen if the info you give is compromised. I use a credit card online solely because of the insurance... the day someone will use my credit card info illegaly, I'll be reimbursed.
Seriously, the European Union had the right idea when they enacted laws to give end-users more control over their data. The majority of corporations really don't care. They'll take as much info from you as they can, sell it, have it leaked, whatever.