The Telegram bot notification has been discussed a few times here already in both the first and second seasons, I'm pretty almost every player here uses it, but the problem how often people pay attention to the notifications, it could be easily when you're away from your devices for a while when the reminder comes, but the interest is what will make everyone not forget about submitting their picks, no amount of notification can help when there is an apparent lack of interest, it's just the same thing with how many people you actively find in the Gambling discussion and how many people have actually ever joined any of the league pools hosted here.
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That's true. I have a Telegram bot set up to notify me on every new message here and it works well. I turned off notifications on almost every Telegram channel that I'm a part of so I don't get pinged that much. But I have also developed a habit on checking questions on Monday and answering them trough Monday and Tuesday so I never miss the deadline.
But I agree that if someone is not that interested in the BSFL, all the notifications in the world won't make them submit answers on time.