If you can somehow do that, sure! If you can get a service below market rates, take advantage.
But surely it's obvious that by definition, very few people are going to be able to luck into such a position. So it's not broadly applicable advise.
> renting $1800/mo in Palo Alto [...] and they aren't raising rent on me
That's the deal of the century in terms of housing. Yes you're way better off renting on those terms. Since nobody else can find a rent so low in Palo Alto, let alone one that won't go up, for most people reality is different.
But then you're not buying any property and renting it out, which was what the GGP was talking about.
That post was not made in a vacuum. It was made in response to a particular claim, which was not as simple as "oh, sure, you can own stocks and pay your rent out of the dividends".
That seems really cheap for Palo Alto.