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Google's shocking developer decree struggles to justify the urgent threat to F-Droid
(www.neowin.net)
This is a most excellent place for technology news and articles.
You're contradicting yourself here. You're saying you were taught to use singular they when gender is unknown, yet claim that "How may apples did they buy" is wrong based on how you were taught English.
Does it matter whether gender is unknown or just unresolved? Not really, singular they is clearly intended to be a gender neutral pronoun and works in any situation where gender is ambiguous. It's not wrong for people to adopt it as a pronoun to refer to themselves any more than it is for a trans man to adopt "he/his" or a trans woman to adopt "she/hers."
At best your refusal to use it makes you sound like one of those people who gets offended at the word "literally" gaining a colloquial meaning that differs from its original definition. At worst, it presents as transphobia to claim "language purity" as the reason to be so adamantly against something that the trans community has largely adopted.