We launched CAS (Combot Anti-Spam) less than 2 months ago, on the 4th of May. Today, I checked the CAS database for deleted accounts. Out of 60000 CAS banned accounts, 22800 were confirmed to be deleted and were removed from the CAS database. That's 38% of CAS banned accounts. For us, this is pretty straightforward. We're doing a good work detecting spammers and Telegram indirectly confirms this by deleting their accounts automatically. CAS usage has been growing steadily - right now we receive ~2 requests per second to our CAS API endpoints. Read more about CAS here.

Alas, I have to say that for the last two weeks Combot has been under DDoS attack and it's still going on. We are extremely sorry for any inconvenience this may have caused. I didn't expect the attack to last that long.