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It certainly was used as a symbol of Judaism in general, until Israel escalated it's genocide and started claiming that all Jews globally must support their genocide or they're not real Jews.

Many Jewish groups, unsurprisingly, fought back against that. Pretty much any Orthodox Jewish community at this point has abandoned the symbol along with the concept of Zionism(since it's not supported by the Torah in any way), with many less religious communities now also joining in. As it turns out it's pretty easy to abandon a symbol that was only adopted a century ago in your multi thousand year old religion.

Anyway, anyone wearing a star of David at this point in Israel's genocide, especially one coloured in blue and white, colours that have nothing todo with the symbol outside the context of a zionist Israel, is a Zionist actively wanting to broadcast their support for Israel and it's actions.

Any restaurant that features themes of the region but isn't itself owned by Zionists would want to ensure no one with, especially a blue and white, star of David is on their premises; the same way a Bavarian grill outside of Germany in the 1940s would desperately not want to accept anyone with a fasces, eagle, or swastika on their clothing entering their property – despite the former two being long time German symbols.