iPhone’s Brave Rewards have been phased out - you can no longer earn any Brave Rewards on iOS. Brave has provided a process to transfer out your BAT from iOS, but note that many users are reporting missing BAT when transferring.
Android requires 25 BAT to connect. If you feel that’s too much BAT, you can try creating a Brave Creators account, and tipping/donating BAT to your own Creators account.
The ToS explicitly said that self-donating grants is not allowed, but said nothing about credit.
The Brave developers, knowing well how flawed the 25 BAT limit is, and how this is the only workaround, have refused to comment on its permissibility. Anyway, they get a 5% (iirc) cut out from donations, which i can imagine they’re all too happy to pocket anyway.