Note that online banking already is secure -- anything you send (ID, password, etc.) is encrypted by your computer, before transmitting over the Internet to your bank. Similarly, everything you receive was encrypted before it was sent to you, and is decrypted by your computer.
Hopefully, any online shopping portal also uses "secure-HTTP" protocol for full encryption/decryption.
Using VPN means that everything you send is encrypted before being sent to the VPN-server, and the VPN-server forwards your information to the bank's server. So, there is the additional risk that the VPN-server could get compromised -- it probably is a "high-value-target" for Internet thieves. Also, because the VPN-server is simultaneously supporting many of their customers, it could be much slower than a "direct" connection to your bank's server.
Some colleges & universities & businesses run their own VPN-server, as an extra level of security & authentication, when your computer is not physically present "inside" their physical location. Compare to an airport's security -- you need to show a boarding-pass to enter their "departure" lounge, or to show "employee" ID.
Finally, the "ShawGo" network was created by Shaw in March 2020, at the start of COVID-19, to provide free Internet to all. Only Shaw knows if/when Shaw will terminate that network, forcing you to sign-up with Shaw or Telus to pay for your own Internet access.
