Identifying whether we are a gambling addict or not can actually be done by ourselves, as long as we can be in a calm state and are willing to self-introspect. But usually an addict will not want to say that he is an addict, because maybe they also realize that there are negative connotations in the word addiction.
We can realize that we are an addict if we are doing something that should be done, for example spending time gambling when there is work that has not been completed and so on. The points made by Op are also criteria where we are not categorized as addicts, but don't let it happen that when we feel we are not addicts we actually do things that go beyond the limit.
I know that person, he is my friend, who does gambling where work or other things that he should do first are completed, instead choosing to take the time to do gambling, but he says that he does not feel like a gambling addict, and what he did what I noticed was excessive, so he used the money from selling his own motorbike, saying if I won I would buy a motorbike twice as luxurious as the one he was selling for capital in gambling.
Well it's exactly what I said, they won't want to be told they're an addict, or they'll even react more than they should, for example they'll get offended and angry when we say they've become a gambling addict.
In such a situation we will actually be completely wrong in acting, if we let them be our friends who should as friends should remind each other, if we remind them, they will react which will make us also upset because our good intentions are actually rewarded with an unexpected response.
If I may suggest, you should not let your friend, because if you let it, it might be even worse. I'm afraid that if you don't care, you will be blamed for not reminding them, even though you tried but gave up.
There are many experiences about this, but some people can accept it consciously, while others find it very difficult and respond negatively.
It's funny sometimes if you think about it, we are the ones who have to remind, we are also the ones who have to be patient with people like that. But this is life. It wouldn't be fun if there weren't people like that, Lol.
Maybe for online addicts, phone addiction could be termed as positive addiction. Yes if you miss to gamble for sometime probably because you are busy in another schedule and you don't regret not gambling it means you are walking away from addiction. In fact, for an addict no other schedule come first if not gambling and betting the day's game. 
