YouTube Music now remembers the position of a track when you close the app.

As the title says, YTM now remembers the exact position of where you left off in a track. When you close the app, and open it again, you're able to just pick up the track at the last position.

It just remembers the position, and plays at that position again. As you can see I recorded it for you:

Imgur upload

If a immature streaming service like YTM is able to implement such a feature, why can't a bigger player like Deezer do it as well? 

When you close Deezer and open it, it just plays the track at the beginning, and doesn't remember the position.