(based on public user discussions, not an endorsement ):

Small file size that does not require heavy system resources.

: Third-party activation tools are often flagged by antivirus software. They may contain malware, such as trojans or miners, which can be bundled within the Legal & Ethical Concerns

Some activators connect your computer to unknown, non-Microsoft servers to maintain activation status, potentially exposing your personal data to third parties. Safe & Legal Alternatives