Thank you. I remember this being super popular in my blogging times (this and third party comments system) but when I needed one I didn't find any. So before bed yesterday I wrote one. Glad you liked it.
It is a dynamic image generator written in PHP that increments the counter it renders. It runs on a PHP web server. Its not serverless.
For true serverless, turn off your PC, laptop and phone and go for a walk in nature.