The fact that sites on Tilda do poorly in SEO is a myth. In short, the constructor offers quite a few possibilities. More specifically, in Tilda it is possible to prescribe and mark up headers, meta-data, set canonical, transfer the site to a secure protocol (https), prescribe 301 redirects (c www and https), prescribe OG markup, close pages from indexing, create an xml sitemap. Plus, by default, websites are adaptive and without duplicates.