Refer a friend cannot be enabled with discounted yearly plan

[taipeicoder]

Context and steps to reproduce

1. Start at /earn/:domain using a site with a yearly plan paid with credits.
2. Click on the "Earn free credits" and expect to see the error below

As explained in #99292 (comment), there is more to the criteria than checking whether the site is on a yearly plan. Worth mentioning that this not only affects plans paid with credits, but also discounted plans that does not meet the threshold.

Site owner impact

Fewer than 20% of the total website/platform users

Severity

Moderate

What other impact(s) does this issue have?

No response

If a workaround is available, please outline it here.

No response

Platform

No response

[taipeicoder]

Reported in 9556624-zd-a8c

[taipeicoder]

@dzver cc'ing you based on this Slack thread p1738742278334649-slack-C02FMH4G8. This seems to be low occurrence enough that I wonder if all's needed is a more descriptive/contextual error message.

[github-actions]

Support References

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• 9556624-zen