It's true that the Bitcoin network is designed to be highly secure and resistant to attacks, but there are still potential vulnerabilities that could be exploited.
Regarding your question, it is possible for a government or other entity to intercept messages sent over the internet, including messages sent to the Bitcoin network. This could be done by intercepting traffic at the internet service provider (ISP) level, or by using other methods such as hacking or social engineering.
However, it's important to note that even if a message is intercepted, the encryption used in Bitcoin transactions makes it extremely difficult for a third party to alter the message or steal funds. As long as the user takes proper security precautions, such as using a strong password and keeping their private key secure, their Bitcoin funds should be safe.
That being said, it's always a good idea to be aware of potential security risks and to take steps to protect yourself, such as using a VPN or Tor to encrypt your internet traffic and using a hardware wallet to store your private keys.