We don’t block any traffic, so I am not sure what is happening from your description. Could you give more details about how you are observing the blockage and how we can reproduce it to see it as well?
The “service” most likely related to different behavior on facebook/instagram is prerendering (described in more detail here: [Support Guide] Understanding and debugging prerendering), but you don’t have that enabled so there should be no effects…and anyway, all URL’s for your site would work equivalently with it (sotos-nakis.netlify.com vs sotosnakis.com)
So, please give us some reproduction steps so we can better understand what you are seeing 