The straightforward answer is:
it is not an ellipsis.
It's that simple.
Much as Colbsdotcom suggests.
Note that an ellipsis has very specific meaning and purpose, that something has been omitted.
Indeed, note that these days in most word processors, when you type three dots, it (sometimes annoyingly) converts it to the single ellipsis character. (Not actually three periods...there's one single glyph which is an ellipsis.)
In complete contrast to an ellipsis ("something missing"), it's common in casual writing to do something such as the following: the car approached the wall and then......................bang!
For me a "lot of periods" kind of suggest "time passing" or "we're about to tell you the punchline" or "wait for it.....". We all do this all the time in casual writing; and it has nothing to do with an ellipsis.
Indeed the famous "Long time ago" example is indeed perhaps the most famous example of using "a lot of dots" like that (just as one very commonly does today in texts or email.............for various reasons such as in this sentence separating a "payoff" phrase. Or, to leave the reader hanging..............)
So, quite simply, it's not an ellipsis (it has nothing to do with "omitting something"); it's a "lot so dots" symbol, which is indeed commonplace in casual writing...........particularly emails or QA forum posts.