I run a SaaS service and noticed we did a couple of these 'dark patterns', but not intentionally!

I've now added to our short term roadmap changes that will resolve these problems.

1. Emailing account holders a couple of days before billing to give them an opportunity to cancel.

2. Emailing account holders whenever a change to their account occurs which would affect billing.

This wasn't us being 'dark' more 'lazy', but thanks for highlighting!