On the iOS app there are conversation bots where you can "chat" with a bot on various topics and earn XPs. I loved that feature on the app and used it daily, sometimes more. However, it has been a long time since I received a notification for a chat or the option to start a new one. So I guess my question is, is there a limited amount of chats you can have or is Duo slowly phasing out that feature as well?
The bots are still there but they are only for a few languages. If you open the app you should see the bots option on the bottom menu icons. I am not sure about notifications though as there are no bots for my main languages. You could check the notifications in the settings menu but otherwise just go into the app and use them.
There is not a limit on bots, I think they have just slowed down making them. I am guessing you have about 45 of them. You are able to repeat bots and try different answers and you will still receive XP. The bots I know of are on French, German, Spanish and Portuguese.