Iv seen posts with people substituting rape with r@pe. Other than bypassing filters I can’t see a reason to censor just 1 letter that doesn’t actually censor the word? I see if you fully censor the word, but even still context completely ruins the censorship.
The issue is not that social media platforms filter it out, but they outright block it if it’s used. So while I can understand you frustration it’s misdirected.