On PS4 European Servers you can find a lobby at any time of the day, really. Most of the time 2-3 people are missing and it only takes a minute to fill the lobby entirely.
@Gormey You wouldn't want the game to start with bots. The team with the most bots will always lose, they're terrible in this mode. Problems with pathfinding, terrible ability timing, Citron never uses the shield unless no-one is around, Nightcap only moves 1 meter while using Shadow Sneek, Corn Husk Hops to areas accessible via stairs, they run off alone in general ... . The list just goes on.
At least they are better than not having something to compensate for the missing player. I guess they can act as a distraction for a small amount of time.