An IRC bot is used on the #deltachat channel in Libera Chat network: GitHub - simplebot-org/simplebot_irc: [WIP] IRC ↔️ DeltaChat bridge
There is also a new Telegram bridge released just a few days ago: GitHub - simplebot-org/simplebot_tgchan: 🌉 Telegram channels subscriptions in Delta Chat
Both are developed by @adbenitez