Apologies for the late reply.
It turns out that this is already a known issue that the team is working on and I’m told will be resolved by the end of the month. Waiting for more information on this myself – I do appreciate your patience.
Taken from #4 in the thread linked below:
Self-tipping is okay under certain threshholds; excessive self-tipping will result in your BAT being frozen. If you want to self-tip to test the system, please use the smallest amounts possible to avoid being flagged for fraud. Self-tipping from the Android build of Brave to your own publisher site as a means of offloading mobile BAT is also not permitted – a working withdrawal function for BAT on Android is on the way. Until then, BAT on Android is solely intended to be used to tip creators who you would like to support. If you have lost BAT on Android for any other reason (such as the auto-contribute bug ), please write an email to firstname.lastname@example.org.