Show HN: Automatically copy events between your calendars

I initially built this one for myself. When working from home and with multiple clients, I had to manually add my appointments so that my colleagues wouldn't accidentally book that time. After a while, it just became tedious and I decided to build this out.

I think this will be useful for anyone working with multiple calendars and also service providers who manage appointments through calendars.

Looking forward for your feedback!

Also, appreciate any inputs on the pricing, ideally I would prefer this to have it as a buy once software, but I'm afraid the APIs would evolve and that would need continued work on my side.