If I may ask, I'm interested in your opinion on why bitcoin is not a cryptocurrency, here are a few possible reasons that I know of:

No central authority: Bitcoin was created with the idea of complete decentralisation. Some crypto users may believe that because bitcoin has no central control, it is more "crypto" than alternatives.

Technical features: Some communities may focus on the technical aspects of blockchain and smart contracts. For example, Ethereum offers greater opportunities for building decentralised applications, and some may consider it more "crypto" in this context.

Focus on use: Some communities may focus more on cryptocurrencies that are actively used in everyday life (for example, to pay for goods and services), rather than simply as a store of value, which is more typical of bitcoin.

Historical perspective: Bitcoin was the first cryptocurrency and, for a long time, the only significant representative of this asset class. Some communities may use the terms "cryptocurrency" and "altcoins" to distinguish bitcoin from other coins.