I have had 3 accounts target my fan casts in a story called Infinity Crisis, all in the span of 23 minutes.
https://www.mycast.io/profiles/19943/username/snowday12
https://www.mycast.io/profiles/22614/username/kelton5678
https://www.mycast.io/profiles/32918/username/makeuponourown
All three users live in the USA, and if that's not enough, they support each other's castings, block all three users before they target your fan casts next.
EDIT: 5 more
https://www.mycast.io/profiles/35934/username/needsalt45
https://www.mycast.io/profiles/22673/username/youcanmakeit234
https://www.mycast.io/profiles/21451/username/lethalfight57
https://www.mycast.io/profiles/28896/username/snow34girl
https://www.mycast.io/profiles/22742/username/haverhill35