

When that setting gets checked, the IDFA gets set to all zeroes per the developer docs. So it definitely doesn’t stop data collection or attempts to target, it just changes that one data point. Instead of an easy “this specific account is associated with this action”, you instead get “someone who clicked the opt-out button is associated with this action - you’re going to have to target them using other details”



It’s a Unicode CJK variant. There are a bunch of characters that Unicode considers to be the same character but with small regional differences (e.g. how it’s written in Mainland China vs. Taiwan vs. Japan vs. Korea, etc.). Since the region isn’t encoded in the character, you’re seeing whatever your system locale and font default to. For web pages, you can specify the region inside the HTML or HTTP headers and hopefully you get the correct character rendering, but that also requires you to have a font installed that includes the variant.
https://www.typotheque.com/articles/understanding-cjk-regional-character-variants