We can say without a doubt, having executed over 15k guest posts that it is totally safe. We have weathered all the Google updates over the years with our guest posting strategies.  In fact, Google no longer penalizes sites for link building. Google changed their strategy many years ago because it was too easy for competitors to point lots of low quality links to a competitor (known as negative SEO) in order to get them penalized. Now Google will just devalue what they deem as low quality links. We avoid this by only working with publishers that are in good standing with Google and that have a high level of organic traffic and keyword rankings themselves, which proves that Google trusts them. Most guest posting services only focus on metrics like domain authority or domain rating. These metrics can be easily manipulated. Which is why we focus on publishers with organic traffic.