You can like, just normalize the input on the backend when scanning for spam. Every spamfilter I've ever used that's worth a damn does that. Sometimes you get

You can like, just normalize the input on the backend when scanning for spam. Every spamfilter I've ever used that's worth a damn does that. Sometimes you get slightly odd syntax (I once configured one that replaces A with a 4 so it could detect common fake uses), but this is a solvable issue.