Most of what keeps a Discord active or not is content and having things to chat about. You list things in an order that suggests the chat started to slowly die and then your channel's focus shifted, but maybe it was the other way around and not as much as of the audience that had found their way through the Discord followed you through the channel refocus as you expected?
Just like in IRC, you probably don't care about most messages. You don't need to be in every conversation. But it can be a great way to just jump into a live conversation or start a new one.
In a lot of ways, this is a major regression as far as security and redundancy is concerned.
There's also the good old saying: Don't build your castle in somebody else's Kingdom. Bot developers definitely learned that recently. I don't have a lot of pity for bot developers though as many are truly, in fact, scraping data and doing other undocumented things with it (Spy Pet wasn't and won't be the only one). All I'm going to say on the matter!