Do you not understand that rechargeable batteries have a lifespan? A finite amount of cycles where they're viable to recharge and continue use? If you have an iphone, have you checked the reported battery health on it?
The point is, if something is producing power and never needs replaced, it never goes bad. As in, it's not just rechargeable it's effectively infinite from the perspective of a human's lifespan.
So, no, rechargeable battery manufacturers aren't out of business because after a couple hundred recharge cycles they need replaced still.
Similarly, with devices like phones where the batteries are usually sealed in, the batteries go bad after a year or two and frequently you're met with "Should I pay $150 to get the battery replaced or $1000 for a new phone?" and, after 2 years sometimes it's more practical to replace the phone. But you wouldn't be met with that if your battery lasted "forever" you'd replace the phone when you couldn't stand the age anymore or when it fell out of support or when you broke the screen. Most of those things take way longer than the 2 years or so of daily recharges that it seems phone batteries last.
If you can't understand why, think about devices that are plugged in. (which is effectively what this would be since it generates power) I've had the same computer running nearly 24/7 for about 6 years. In that time, I've replaced some batteries and bought new phones/tablets/etc due to batteries that started dying at 20% or not fully charging.
