Paypal - Linking bank account

I don't think so.
Happened to me once, I was forced to change banks.

change the card

I have my bankacc linked to pp and can pay on some sites. I can pay on bundlestars but not on humblebundle. So linking it doesnt necessarily mean you will be able to pay with it

Paypal allows you to spend money if you have a bank account , in US but it varies by country so idk but it should since its a bank account and paypal prefers bank account as your main(Defaut) funding source.

I have my bank linked via PayPal. You set up a direct debit agreement with them, then you can use your bank to make direct payments via PayPal.

I have mine linked and can use Paypal world wide - so Yes.

When I first setup my PayPal, I didn't have a CC. Was able to make purchases through my bank, however you have to have your bank setup your account to allow for it if it's not already. That being said, if you ever have both your CC and Bank on your paypal, be very careful with how you make purchases, and that it's set to the proper primary. Had an incident once myself where I wanted a purchase charged to my CC, and it instead charged to my bank causing me overdraft fees. Really sucked.

can your bank provide you a virtual card?

You can link your bank because I did it because I did a lot of HH group buys with PayPal. It meant I had no/little fees on money I sent. It takes a few days to set up :)