My bank's online T&C's prohibit disclosing logon credentials to a third party. They also state I am responsible for using devices and software that meets standards and requirements. I could not do that if using Mogo's "smart browser" or app.
We are assured that Apple, Google and Symantec approve or certify this app.
Apple & Google only check an app doesn't violate their store T&Cs (e.g. containing offensive material). Symantec only certify an app is free from viruses or malware.
None of the above companies guarantee that if you use the app that your credentials are safe. They cannot see what an app does internally, or what Mogo's servers do.
I am an app developer, I know how it works.
However, this Mogo app may well be perfectly safe. But I wouldn't attempt to use it.
The UK website is very new. Looks like this outfit comes from Australia.
web.archive.org reveals the website mogobankconnect.com has not been around long. It's registered to Amanda Relton (no company name) : have a look at her profile :
https://www.scrumalliance.org/community/profile/arelton
Mogo is a poor choice of name... Google "Mugu"
Addendum : Not saying there's anything inherently wrong with Mogo, just a little "tin-pot" for my liking. Also, if anything goes wrong I don't fancy trying to get help with only an Australian email address to contact.