Musk was due later on Monday to speak in the southern Polish city of Krakow, a short drive from the memorial, at a conference addressing the rise in anti-Semitism since the Israel-Hamas conflict started in October.
X - formerly Twitter - has seen some major advertisers pause spending or flee since Musk late last year described as "the actual truth" an X post by a user espousing an anti-Semitic conspiracy theory.
A report from liberal watchdog group Media Matters precipitated the advertiser exit, which said it had found ads next to posts that supported Nazism. The platform has filed a lawsuit against Media Matters for defamation.
