6 Months Free VPS from BudgetVM

I received an email from BudgetVM last night, offering 6 months of free VPS use. You can choose from a variety of VPS. Why do they provide AiBa with a free VPS?
Although the original text should be machine translated, the general meaning is that AiBa mainly introduces information about various VPS and other hosts, but there is no BudgetVM, so a trial is provided.
So, I chose the cheapest model of xen. A demonstration site and related reviews will be provided later.
BudgetVM homepage: https://www.budgetvm.com