Not saying it's not that bad, it's awful right now, but it's been worse before. When they banned the word I for weeks over 2 years ago, unbanned it, then banned it again that was the worst. The number 1 and lowercase L was also banned at the same time. This is bad though and it sounds like since it's affecting PC too that at least part of the filter problem is some other filter they use too. I just know about the xbox one they use which is what's responsible for messages not even sending in chat because you used a banned word like "could".
I'd think that game companies would have a way to contact Microsoft when their fitler goes nuts and bans words like "could" and "lol" and "I". I'm not sure if they just don't care enough to contact Microsoft or if Microsoft doesn't care eough to fix it, or both. If they made their own filter on XBox, like many games do, they could stop relying on the mirosoft one so at least when it's broken they could fix it quickly.