Keeping up with competition is part of trying to stay in the frontier. If they stop training the profit disappears in a few months.
Insane competition does not last forever. When chip manufacturing first started, there were dozens of companies that had fabs that made compute chips. Nowadays, only TSMC is viable. Samsung and Intel survived because of geopolitics.
We'll see I suppose. Until the audited financial statements are released, no-one who doesn't work for an AI lab can be sure.