A solar storm has a massive potential for destruction, especially when it comes to electronics and infrastructure. So, any big enough solar storm today, would have a catastrophic impact on the global infrastructure that keeps our Internet running. However, if the digital infra is destroyed, it will bring the Internet down along with it.
An Internet outage in this modern era will not only cause massive money loss, it would also cost many lives. The Internet is the backbone of everything that happens in the world today, but nothing carries a greater threat of a mass outage than solar storms.