Public blockchains, while offering transparency and security through their decentralized nature, face several challenges that can make them less appealing for widespread corporate use. Here are the primary reasons:

1. **Privacy Concerns**: Public blockchains record transactions on a publicly accessible ledger. For many businesses, confidentiality is crucial, and exposing sensitive data on a public platform can be a significant risk.

2. **Scalability Issues**: Public blockchains like Bitcoin and Ethereum can handle only a limited number of transactions per second . This limitation can be a major hurdle for applications that require high transaction throughput.

3. **Control and Governance**: Companies often need control over their networks, including the ability to update protocols and manage network participants. Public blockchains operate on a decentralized model, reducing the single entity's control over the network.

4. **Regulatory Compliance**: Compliance with regulations such as data protection laws is more complicated on a public blockchain, where data is immutable and cannot be easily modified or deleted once it's written.

5. **Energy Consumption**: The proof-of-work mechanism, used by many public blockchains to achieve consensus, can be extremely energy-intensive. This can conflict with the growing emphasis on sustainability and corporate responsibility.

6. **Transaction Costs**: During times of high demand, transaction fees on public blockchains can become prohibitively expensive, which can be a deterrent for businesses that need to maintain low operational costs.

Due to these challenges, many companies prefer private or consortium blockchains where they can enjoy some benefits of blockchain technology—such as immutability and security—while also retaining control over the network, ensuring privacy, and managing costs and performance more effectively.