why do some players which are less than 700 rating, those people are not having premium account. WHY

I am not understanding if those people have more or the other..... and a premium account might be something I would dance..   IF YOU'RE LESS THAN A THOUSAND THEN TELL WHY

I am a platinum member. My bullet rating is 1821

Maybe spending so much for a year is beyond what people are willing or able to pay. It is a pass time, not a necessity. For me the only function I like that is worth paying for is the unlimited Game Analysis. But I can get that for free on another site. It is just the presentation that differs and the exporting the PGN. If I want to get better I will stop playing when tired, distracted, stressed and start playing longer time controls whilst blunder checking on every move. But I am not that disciplined, so lower Elo it remains.

I don't understand your point.

You have have had a diamond membership for several weeks.

Have you taken lessons? Tried the Insights? Done drills?

Why spend money on a game that is free?

I love the game review feature. It quickly points out all my blunders then gives me a detailed description of why they are blunders. I sometimes need a thorough explanation, especially before my first coffee in the morning! 🤪