lightsail is basically the lowest tier of AWS offerings. It's designed to compete with providers like linode or digitalocean, not gcp or azure. Moreover, lightsail is IaaS - you get a vps that you have to set up and administer yourself. Squarespace/Netlify is PaaS or SaaS - all that is handled for you. Maybe you think all of that isn't too hard and isn't worth the $14 or whatever premium, but it's still comparing apples to oranges.