YouTube is rolling out a new feature for notifications you receive from channels you’ve subscribed to. Years ago, you subscribed to a channel on YouTube. At the time, you really liked it, so you set your notifications to “All” to always get a push notification on your phone when something happened there. However, over time, you started to care less about the channel. Now, you still get notifications about the channel’s activities, but you don’t care, so the notifications are just annoying chatter that you skip.
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Google knows this happens quite often. Google also knows that unfortunately many people deal with this not by unsubscribing from the specific channel, but by turning off YouTube notifications entirely. This isn’t ideal for obvious reasons, so Google is testing a new YouTube feature that intelligently reduces notifications for subscribed channels that you no longer visit much.
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Now, this won't affect channels you visit regularly. If you've interacted with a channel recently and it has "All" notifications enabled, you'll still receive a series of push notifications related to it.

But when you stop interacting with that channel, the notifications will decrease over time without you having to do anything. It's a win-win situation: you get fewer notifications you don't care about, and Google reduces the chances of you turning off notifications altogether.
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This is just a test, so there's no guarantee it will actually go live for everyone. However, it seems like a great new feature on YouTube, so we hope it comes out of the testing.
Source: androidauthority
