DO is well-known on HN, but I don't know anyone else who's heard of it. The deletion reason was "A7: No explanation of significance", which requires "a credible claim of significance or importance" to have a page on wikipedia. Merely being popular among entrepreneurs, or having some number of customers, doesn't make a company significant in the encyclopedic sense.
It was deleted again for "G11: Unambiguous advertising or promotion", and the five sentence article about their "fast, low cost options" does in fact read like an ad. It wasn't fact-checked, either, since DO is not larger than Amazon nor does it operate its own data centers.