In order to use Tip Jar WP you need to be able to use Stripe. Because of that, any businesses or behavior not allowed by Stripe’s Terms and Conditions is also not allowed on Tip Jar WP. You can review Stripe’s Terms and Conditions here:
Also take note of prohibited business categories on Stripe:
If your usage falls into one of the prohibited business categories described by Stripe in the link above, you will not be able to use Tip Jar WP with Stripe.