It's my API endpoint for Plausible (private website analytics), not sure why it would get flagged

Yeah, me neither. I opened the link along with several other article links from the front page so it sat idle in a separate private tab waiting for me to get to it and just as I clicked on it MWB popped the warning. I'm using LibreOffice with container tabs and MWB Pro under Win10 Pro. Probably nothing.

Thanks for the explanation.

Protomaps sounds interesting.