Many non-Adobe applications (video editors, PDF readers, even some games) rely on Adobe services for license checks. Your block list could break them.

Prevent the software from automatically downloading and installing updates that might break specific workflows or "patch" activation bypasses.

Lists found on platforms like GitHub typically redirect these domains to 127.0.0.1 or 0.0.0.0 : Ruddernation-Designs/Adobe-URL-Block-List - GitHub

Even if you find a "working" block list online (often promoted on YouTube or Reddit), the risks are substantial.

Blocking Adobe’s license servers will cause:

You will never receive security patches. Older versions of Adobe software (Photoshop, Acrobat) have known remote code execution vulnerabilities. A Hosts block turns your machine into a sitting duck.

(optional, advanced)

Modifying the hosts file to bypass licensing is a violation of Adobe's Terms of Service and is considered software piracy in many jurisdictions.

Serif’s are perpetual license alternatives (no subscription) that cost a one-time fee of approx $70 each. They read/write PSD files and have no DRM that requires a hosts file block.