The line is a Unicode mark added after each character, so it pastes into bios, posts and comments that have no strikethrough button.
In WhatsApp you can also wrap text in tildes, like this. See WhatsApp text formatting.
Strikethrough text
Type your text, then copy the strikethrough style you like.
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Strikethrough
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Slashed
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Wavy strikethrough
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Bold strikethrough
Questions & Answers
Does it work with Arabic?
Yes. The line is added to every character, Arabic included.
Can screen readers read it?
Some screen readers skip or read out the marks. Use it for a few words, not a whole post.
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