Most sites crash on big drops if they do not have the proper firewall to block multiple hundreds of thousands of requests from the same computer. We are not tricking the site into thinking we are more than one computer so this is where proxies come in.
The second run we learned our lesson and have purchased proxies. We are using 4 proxies to run 4 slots and hopefully check out 4 items from supreme. Each one of our slots we set up on our bot is assigned to a single proxy. When we hit start tasks each slot logs in using our proxy and now we look like 4 different customers. The firewall does not pick us up at all now and we can check out multiple items in seconds with no bans.
You can still get proxies banned of course by abusing them. We recommend running one proxy per task to protect your proxies and avoiding bans for the duration of your service. Also all tasks should be started up to 2 mins before a drop. Would a human be searching a site 5 mins before a drop at super speeds? Nope so run as close to the drop time as possible. The ATCproxys team starts 60 seconds before a drop and we have never seen any bans.