After reading all the comments I do not believe everyone understands what this tool is for. It is for taking one set of calendar events and copying it to another one. It does exactly that.
The only flaw I can spot on this product is it does not support iOS to iOS, it is dependent on gmail. I’ve emailed the developer in hopes they can add iOS to iOS (which judging by the work flow, should be easy).
If iOS to iOS is added, it’ll get 5/5 from me.
Note, this is only iOS to Google. You utilize google as the cross platform calendar you’re copying data to.