That is fine, but entering the conversation with a comment that is self-promoting but otherwise unrelated to the conversation at hand is obnoxious, just as much

That is fine, but entering the conversation with a comment that is self-promoting but otherwise unrelated to the conversation at hand is obnoxious, just as much so as someone doing the same for their own person at a party. If you want to promote your product, more apropos and therefore constructive would be a comment detailing why it did not suffer the same outage, or justified speculation why its competitors did. Engage in the conversation rather than just naming a list of features.