[MacOS] What's blocking Google ads? Is there any system wide content filter that I'm missing?

I'm trying to load a website but it keeps giving me an error message that I'm using an AdBlocker. But I'm unable to identify what's blocking it.

I've closed AdGuard, my VPN, NextDNS, Little Snitch and the MacOS firewall. I've tried three different browsers (some of which dont have any extensions installed). I've tried three different user accounts.

I can see in the developer tools of Chrome and Safari that something is blocking https://www.googletagmanager.com and https://pagead2.googlesyndication.com

How can I find out what's blocking it?
Is there any system wide MacOS network filter that I'm missing?

submitted by /u/Old_According-Hat-73
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