ChatGPT Plus lists at $20 per month but the final price changes depending on...

https://penelopessmartdigests.talesignal.com/posts/why-does-google-play-add-cost-to-chatgpt-plus-if-google-takes-15

ChatGPT Plus lists at $20 per month but the final price changes depending on your country and device. Taxes like VAT or GST add to the cost, and app stores also charge a fee that can raise the price on iOS or Android