YouTube, under fire for facilitating the spread of conspiracy theories and other misinformation, says it will no longer serve ads on channels that espouse anti-vaccination rhetoric.
The Google-owned video giant cited its advertising policy that bans "dangerous and harmful" content from eligibility in its monetisation program.
"We have strict policies that govern what videos we allow ads to appear on, and videos that promote anti-vaccination content are a violation of those policies," YouTube said in a statement.
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YouTube didn't specify which anti-vax channels - or how many - were subject to the demonetisation action.
According to BuzzFeed, which first reported the news, affected channels included VAXXED TV, LarryCook333 and iHealthTube.
Anti-vaccination proponents who falsely suggest that vaccines are somehow unsafe for kids remain rife on YouTube and other platforms.
There's overwhelming scientific and medical evidence that childhood vaccinations are both safe and effective at curbing disease outbreaks.
That includes videos promoting bogus miracle cures for serious illnesses, claiming the Earth is flat, or making "blatantly false claims" about historical events like the 9/11 terrorist attacks, according to YouTube.