ChatGPT is providing a ridiculous amount of free service to gain/keep traction. Others also have free tiers, but to a much lesser extent. It's similar to Uber selling rides at a loss to win markets. It will get you traction, yes, but the bill has to be paid one day.

Even when you're subscribed, they're providing unreasonable amounts of compute for the price. I am subscribed to both Claude and ChatGPT, and Claude's limits are so tiny compared to ChatGPT's that it often feels like a rip-off.