Thank you! I hate when articles use acronyms and never actually expand what they mean - I read the entire article without any clue what PWAs actually are.
I agree, it's a bad writing practice. And it's very simple to be completely unambiguous - just use the complete phrase the first time. So in this case, the tagline could just be "Decoding Apple's Desperate Ploy To Scuttle Progressive Web Applications", and then, if people see PWA, they can decipher it themselves.
But of course this seems to be a personal blog, so much of it is up to personal taste, as it should be.