The largest Jackpot-Style Lucky Draw we've supported is for 500k participants with more than 4 million chances in total.
The Mosaic Wall / Thanos Lucky Draw can support either 144, 576, or 1296 concurrent photos being displayed on the digital mosaic wall. However, photos are constantly being swapped in and out. The largest participant pool the Thanos Lucky Draw has supported is 8,000.
The systems are able to support beyond that and just needs proper hardware and infrastructure configuration.