I'm Popular to Many. My popularity increases the weaknesses of others.It's not easy to notice my populace and weaknesses together.The Good thing is that I change every time.who am I?

Based on the information you provided, it sounds like you are a trend or a fad.

Trends are typically popular among many people and have the ability to influence or impact others. When something becomes trendy, it often exposes weaknesses or vulnerabilities in people, especially when they feel the need to conform or follow the trend.

The fact that you mentioned it is not easy to notice both your popularity and weaknesses together suggests that trends tend to mask or overshadow the negative aspects associated with following what's popular.

Lastly, you mentioned that you change every time, which reflects the transient and ever-evolving nature of trends. They come and go, constantly shifting, and being replaced by new ones.