The legality of cryptocurrency mining is subject to various factors and considerations. Whether it will become illegal one day depends on several key factors:

1. **Environmental Concerns**:
– Cryptocurrency mining, especially Bitcoin mining, consumes significant amounts of electricity and has a substantial environmental impact. Some countries might choose to ban mining to meet environmental goals and reduce carbon footprints.

2. **Regulatory and Economic Policies**:
– Governments may regulate or ban crypto mining to control financial markets, protect investors, and prevent money laundering or illicit activities. For example, China has already banned cryptocurrency mining due to concerns about financial stability and capital outflow.

3. **Technological Developments**:
– Advances in mining technology or shifts to more energy-efficient consensus mechanisms, such as Ethereum’s transition from proof-of-work (PoW) to proof-of-stake (PoS), might reduce the environmental impact, potentially affecting regulatory stances.

4. **Energy Consumption and Infrastructure**:
– Areas with strained energy grids or where electricity is heavily subsidized might impose restrictions or bans on mining activities to prevent overconsumption and ensure energy availability for other sectors.

5. **Public and Political Pressure**:
– Increasing awareness and activism around climate change and sustainable practices could lead to greater public pressure on governments to regulate or ban crypto mining.

6. **Economic and Social Factors**:
– In some regions, mining can provide economic benefits, such as job creation and investment. These factors might influence whether a ban is considered.

Given these considerations, it’s difficult to predict with certainty whether crypto mining will become illegal globally. Some regions may impose restrictions or bans, while others might adopt more balanced regulatory approaches or even encourage mining under certain conditions. The future of crypto mining’s legality will likely be shaped by a combination of technological advancements, environmental policies, and evolving regulatory frameworks.