If you are feeding a single frequency/talkgroup it's not an issue. If you are feeding more than one, you can increase the delay on the channel, but that could be at the risk of missing transmissons occurring on other channels. People listening to Broadcastify know that they run the risk of coming in on the random 10-4, so I wouldn't be too concerned about it.
If you are not an official feed, Broadcastify does not allow delayed feeds.