Underscores for emphasis?

Have I missed a memo?

When did underscores before and after _emphasised words_ become something that was acceptable?

It’s dumb. It’s like underlining but, if possible, less visually appealing and more likely to make me write you off as a writer.

What happened to using vocabulary to express emphasis. Some people are so stupid.

Here’s my order of what’s acceptable when you’re trying to emphasise stuff:

1. An emphatic word.
2. An adverb or adjective.
3. Bolding.
4. All caps.
5. An exclamation mark (just because I hate them).
6. Underlining.
7. Underlining and bolding.
8. Underscores.

Anything after 3 is pushing the envelope.