One thing I’ve learned since becoming a home owner ~5 years ago… There’s a lot of stuff on the Internet that tries to get you to a point of hysteria.

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This is the kind of stair step crack you need to worry about. It’s a big gap, many blocks, etc. It’s a sign part of your foundation is sinking.

What you have is a block missing some mortar and a crack below (which can happen if water gets into the block … which happens when you’re missing mortar). You can have someone look at it, but I think an honest contractor would tell you “get it repointed or do it yourself, keep an eye on it.”