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OCBC Bank locks out mobile app if 3rd party apps are detected
(www.zdnet.com)
This is a most excellent place for technology news and articles.
I've escalated this all the way to their app developers and in the end they told me something about permissions to draw over other apps being enabled in the default launcher, which they consider to be "malicious". So my options were to install a third party launcher and forcefully uninstall the default OnePlus launcher (via adb, since any other method would require root), or use a different phone altogether.
Now I'm using Nova Launcher anyway, but it had glitches every here and there where it would default back to the standard launcher, so uninstalling that was a risk I didn't want to take.