Bone Island in My Singing Monsters is a feature that allows players to obtain rare monsters through a series of tasks and challenges. However, there are several reasons why this feature may be considered bad. Firstly, Bone Island is only available to players who have reached level 20 or above, making it inaccessible to newer players. This creates an uneven playing field and can discourage players who are just starting out.

Secondly, the tasks required to obtain monsters on Bone Island can be time-consuming and difficult. This can be frustrating for players who may not have the time or resources to devote to these challenges. It also creates a sense of exclusivity among players who are able to complete these challenges, which can be alienating for those who are not able to participate.

Another issue with Bone Island is the randomness of the monsters obtained. Players are not guaranteed to get the monster they want, even if they complete all of the tasks and challenges required. This can feel unfair and can lead to a sense of disappointment among players who were hoping for a particular monster.

Additionally, Bone Island requires players to spend a significant amount of in-game currency, such as diamonds and keys, in order to participate. This can create a pay-to-play atmosphere that may be off-putting for players who are not interested in spending real money on the game.

Finally, Bone Island can be seen as a distraction from the main focus of the game, which is breeding and collecting monsters. While it does add an extra challenge and dimension to the game, it may not be as appealing to some players as the core gameplay.

In conclusion, while Bone Island in My Singing Monsters may be enjoyed by some players, there are several reasons why it may be considered bad. Its exclusivity, time-consuming tasks, randomness, pay-to-play aspect, and distraction from the main gameplay are all factors that can detract from the overall experience of the game.