The implications for website owners are that their web sites were temporary unavailable.
Traffic simply does not reach the web site. Even normal traffic.
For example, you type in your browser www.mywebsite.com.
DNSMadeEasy would normally resolve it to your IP address (e.g. 111.222.123.12). But because of the DDoS attach -- mywebsite.com cannot be resolved into any IP address and you cannot open www.mywebsite.com at all.