CMC is undoubtfully the start page of the cryptoverse for many people. It is the oldest, biggest data-collector and market observation tool, so the most popular. But early in 2020, Binance acquired it, and after that, the rumor had born, it’s not independent anymore. Next to this, other similar sites grow their popularity, and the CoinGecko is one of the best competitors.
Users choosing the CG more, like CMC, so the gap between them just decreasing, slowly but steady. CMC will be dominant for a while, sure, but this market works with trust, and the real competition is essential for trust.