They won't be able to earn forever no, that'll be their loss then. Considering the reduction of new rewards every 250k blocks and the influx of new users, someone will eventually replace them from positions of earnings or otherwise drive voting power their way instead of there and they'll never manage to get back the HP they so frivolously squandered.
I'm just saying right now there's a lot worse users farming rewards with low effort that go straight to the exchanges, hurting the ones actually doing work that affects others is maybe not the right time. Their work is still more valuable than the hive they might be selling considering half of all hive sits in exchanges and is probably owned by random traders.
And it is probably only a handful of accounts.
ehh dunno, binance is quite big, maybe a handful of US customers however :P