Binance is one of the longest surviving crypto CEX (Centralized EXchange). At last count, they had around 3000 tokens listed. Just like how it is in tradfi exchanges, most of the liquidity is concentrated in the top 50% of tokens.
We use the bid/ask spread as a short-hand for liquidity.
If you want to keep your trading costs in check, then play in the top 5 deciles.