Nah, enshittification is a way better word. Platform decay sounds too natural, like a tree falling in a forest. It's like when the platform itself tries its hand at shitposting. When the software becomes shitware. Not so much a passive voice, but an active somebody-threw-it-down-the-shitter kind of vibe.
I’ll be consulting with Doctorow on how to get more shock value words with ‘fuck’, ‘shit’, ‘cunt’ into English dictionaries for the next generation to learn and say.