Living in Japan, I have to deal with Line but I don't like it. My major complaint is that Line encourages you to spam your friends advertising their games. For example, Line Pop artifically limits the number of times you can play the game, but you can easily nag your friends to send you more 'hearts' so you can continue. Pretty sure Line Play gives you in game currency for inviting anyone to play it, whether they are your friends or not, so I have tons of people I don't know send me requests. This stuff was so spammy I had turn off Line notifications, so I prefer to use normal text messages whenever possible. I could see other users get sick of it the same way I did.