I've been using it for years and I rely on it in such a way that has become essential for tracking the forum, so I don't know what I would do if it stopped working one day.
We don't hope so but if it eventually stopped working one day, there's absolutely nothing we can do other than get used to how it was before. Perhaps, the forum itself will come up with something to notify users for every mention or someone give us another alternative. Aside this two options, I don't think of any other way again.
The bot is a job well done by the developer. We would have been missing important threads where we are being mentioned or tracking a thread we are interested in without the bot. It's one of the reason why I still have Telegram on my phone.