It is not possible to get unlimited coins in Tank Stars or any other game through legitimate means. Many websites and videos claim to offer cheat codes or hacks to get unlimited coins, but these are often scams that can harm your device or steal personal information. The developers of Tank Stars also prohibits cheating or hacking in their terms of service and it can result in a ban from the game.
The legitimate ways to earn coins in Tank Stars are by playing the game, completing daily tasks and events, or by purchasing coins with real money.
I strongly recommend you to not use any hacking or cheating methods as it can harm your device and it’s not a good practice to cheat in any game.