I'm guessing that this is an initial trial and they're intending to extend it further; 6 months is a reasonable trial period given the very rough metric for deciding who qualifies.
> Your complimentary subscription will expire at the end of the Benefit Period. After expiration, any existing subscription will continue unless you cancel. You may independently choose to purchase a paid Claude subscription at the then-current price through Anthropic’s standard signup process.
> Your complimentary subscription will expire at the end of the Benefit Period. After expiration, any existing subscription will continue unless you cancel. You may independently choose to purchase a paid Claude subscription at the then-current price through Anthropic’s standard signup process.
https://www.anthropic.com/claude-for-oss-terms