sboarena.org robots.txt parsing

Sboarena.org has robots.txt file. Http response code is 200.
Robots size is very small. It is about 10 kb and 4 rows.

sboarena.org has sitemap file https://sboarena.vip/sitemap.xml. Robots.txt contains very strange content because there only allow rules and no disallow.

Host directive is not presented for domain sboarena.org in robots.txt file.

Array
(
    [*] => Array
        (
            [allow] => Array
                (
                    [0] => /
                )

            [sitemap] => Array
                (
                    [0] => https://sboarena.vip/sitemap.xml
                )

        )

)

User-agent: *
Allow: /

# Sitemap files
Sitemap: https://sboarena.vip/sitemap.xml

код 301 http://sboarena.org/robots.txt
код 200 https://sboarena.org/robots.txt