Overwatch suffered from a DDoS attack in June 2016 after that they put their servers down for possible Lizard Squad.
Blizzard was facing difficulties with logging in, Overwatch players were being disconnected from matches, leading to a general concern on Twitter that they'll be penalised in line with Blizzard's crackdown on rage quitters.
Source: https://www.vg247.com/overwatch-servers-down-in-possible-lizard-squad-ddos-attack
"id": "OVE102128522",
"linkid": "overwatch",
"type": "Cyber Attack",
"date": "06/2016",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"