No, the online version does match the physical board game release in the Unless States published by Indie Boards & Cards: A deck of 15 cards (5 characters with 3 copies each), so the maximum number of players is 6. Remember there must be some cards left in the deck for the Ambassador exchange power to occur and to prevent anyone from having complete information.
I suppose you could use 4 copies of each character to support 8 players (or 5 copies to support 11 players) but I think there are serious drawbacks. A big part of the game revolves around knowing there are only 3 copies of a card, which encourages players to take the risk of challenging. As the number of copies increases, it's harder to successfully challenge and that's going to change the balance of the game. Also, since the game is player-elimination, it will lengthen the time and number of people who are sitting out, waiting for the game to end.
I'll consider changing the online version to support 8 players in a future version, but I definitely wouldn't recommend playing this way due to both negatives above.