#I have started to see things of the type that Bitcoin supply can be increased, I think it would be good to clarify this issue.

"static const CAmount MAX_MONEY = 21000000 * COIN;"

The COIN variable here is equal to 100,000,000 satoshi (1 BTC = 100 million satoshi)

MAX_MONEY = 21,000,000 BTC = 2,100,000,000,000,000 satoshi

This geometric series:

Total supply = 50 + 25 + 12.5 + ... ≈ 21,000,000 BTC

For example, if we make this change in the code:

static const CAmount MAX_MONEY = 100000000 * COIN; // 100 million BTC

If nodes accept this, theoretically 100 million BTC can be mined, but in practice, it would be another coin, because Bitcoin's core value proposition is scarcity and immutability. Increasing the supply would be a betrayal of this. Most people will continue to use the old chain (21 million supply ). Just like in the case of Bitcoin Cash in 2017, the new chain will not be called "BTC." The original chain will remain permanent.

Supply can be technically altered, but this would be another coin, it cannot be Bitcoin. The 21 million limit is protected both technically within the software and by social contract. For this reason, the supply of Bitcoin can never exceed 21 million.