Freelance writing these days is not very lucrative. Personally I won't touch it for less than $1/word (so about $1K/article = ~ 1 day). Which, if you do the math and account for all the unpaid time needed to be in a position to write a $1K article still isn't a lot of money.

The technical articles can serve as highly effective ads to lure your potential customers. The kind of technical writing that will leave no doubt in the minds of your readers that you demonstrate deep expertise in the technologies you are an expert in.

Here's an example https://burke.services/segment.html taken from https://burke.services/

This is generally true of writing in tech whether articles or books. You can usually make more as a side effect (or as part of a salaried position) writing than you ever will with someone paying you directly.

This.

If I write an article that shows how your SaaS integrates with <POPULAR_SERVICE_OR_FRAMEWORK> then this is worth much more than $500.

$1k / 2 articles.