Did someone really just write a blog post on not downgrading an account without knowing what you're doing? Yes, you should not do that. You also shouldn't buy something without knowing what you're paying for, shouldn't vote for something you don't know what it is, you shouldn't eat stuff which might be poisonous but don't know for sure, you shouldn't cross a street without looking, gosh you certainly shouldn't drive…
They then further go on to say, "... when upgrading back to a Pro account, any branch protection rules you had before were permanently deleted when you downgraded to the free tier. They will all have to be recreated from scratch."
That is useful information, to me. People write blog posts about all types of things that are obvious to some and useful to others. Why be so nasty about this short post that seems to be useful to a lot of people? I guess that's 2019 for ya.
It's easy to ask snarky questions. That doesn't mean it's helpful or witty.