Why hire a web developer when you can do it yourself? First of all, here are some basic facts. Any company, including giants like Wix, GoDaddy and Web.com generate revenue on hosting, which is storing your website files and making them accessible, and handling email.
When they say your website is free, it likely takes into consideration that it is free for you to do the work without pay, which can take many hours and be exhausting. After that, you pay monthly rates higher than what Fullstack charges.
Look carefully, because you will likely be doing lots of work, even with free builders and you will pay for it in the long run. If you want to change providers, you may find you end up spending much more than dealing with a local web developer the first time through.
In addition, if you do it yourself, don't be surprised if the SEO coding and look has an amateur feel to it.