The offer is available to One App Free plans as well as the Standard and Custom plans. 

Ensure that your website contains enough original content for Odoo to verify that your request is legitimate and respects Odoo’s Acceptable Use Policy. 

Given the high number of requests, it can take Odoo several days weeks to review them.

After the first year they charge you the https://www.gandi.net/ renewal rates.

Edit: I just modified the link to Gandi's website.