If you are developing a bot to be used on ONE channel only, there is no reason to circumvent the Message limitations.
If the bot for ONE channel is going to get near the limit, then it’s a misuse of chat (in my opinion).
The large multi channel bots, create more than one instance of the bot running from more than One IP Address I believe.
But never do they have two IP address’ed bots talking to the same channel.
If your user/bot account is hammering one channel hard enough to hit the limit, then you are doing something wrong and your design is wrong. If you are building something like a game where the game outputs responses to chat, then Twitch is likely no the right platform, for example.
On a normal one channel, if your bot is going to spit out THAT many messages then the messages are going to be lost in the wall of “spam” that would be created.