No.
I cannot speak for Stack Exchange, but I can speak for myself and banning only Hindi characters won’t make a significant impact on spam at best. At worst it will alienate legitimate posters.
Okay, so you saw one piece of spam (I believe this one) where the title was written in Hindi. That is just one piece of spam among dozens — if not hundreds — of pieces of spam.
Simply using Hindi characters as a determining factor will not stop the floods of spam when the spam arrives. At worst, it will alienate legitimate questions from Hindi native speakers who post in English with Hindi text as example.
If you were to do that the question would be, “Well, what about other non-English characters? Should posts with these characters be banned?” And they shouldn’t.
The same logic holds for Cyrillic, Japanese, Korean and Chinese characters. Some could legitimately in good faith post a question along the lines of “Why won’t a filename like こんにちは work on Windows 11?”
I don’t know if that is a particularly good example of a question, but the general idea stays the same: If someone posts in English with non-English characters that runs the risk of alienating a legitimate posters for the “benefit” of maybe flagging some random spam post.
To quote Blackstone’s ratio:
“It is better that ten guilty persons escape than that one innocent suffer.”
Which can be adjusted to Stack Exchange as:
“It is better that ten spammy posters escape than that one legitimate poster suffer.”
I mean, I would be shocked if much of what passes for spam would somehow sneak past us 10 times, but you get the idea.
