What makes a link actually “safe” in 2026?

Everyone says they sell “safe backlinks,” but that phrase feels almost meaningless now.

Some people mean white-hat outreach. Some mean niche edits. Some mean private sites that look clean. Some just mean “we haven’t had a penalty yet.”

In your opinion, what makes a backlink safe today?

Is it relevance? Real traffic? Editorial placement? No obvious seller footprint? A clean outbound link profile? Something else?