Even with a great Tsum, poor technique kills your coin income.

Developers regularly monitor for sudden, impossible coin jumps (like 100 million coins overnight) and permanently ban offending accounts Security Risks:

Most "hack" videos showing 99,999,999 coins are either edited or using temporary local memory edits that do not actually sync with the game servers. Legitimate High-Volume Coin Farming

If a coin hack worked, the game’s economy would collapse, and LINE Corp would patch it immediately. Developers constantly update anti-cheat algorithms. Do not waste your time or risk your security.