Hence why you should not have banking/brokerage apps on your phone (or their passwords in your iOS keychain), except maybe a checking account with a couple thousand dollars in it.
In Australia, transfers out of an account are limited to a certain amount ($2000 typically) unless you've pre arranged it with the bank. Also transfers to new accounts have some extra protections. I'd be surprised if this wasn't common practice globally
I can do transfers of at least $250k from my phone.
Not true. You can set a number of accounts to up this in the bank app, with nothing more than a sms code to protect you. $100k no issues. And never seen a $2k limit, maybe a $5k limit.