The EaseUS hosts blocker.bat script adds entries to this file, mapping EaseUS domain names (like www.easeus.com ) to an invalid IP address, such as 127.0.0.1 (your own computer). This rerouting causes any attempt by the software to "phone home" to fail, effectively blocking the connection.
Here are the common types of block lists found in such scripts: easeus hosts blockerbat verified
If you're interested in the privacy benefits of a Hosts file blocker, there are many trustworthy, open-source tools designed for general system protection, not for cracking software. The EaseUS hosts blocker