Generally, giving users a toggle to get reminded when a trial is about to run out will INCREASE conversion rates.
That depends on the business, and is part of a pretty standard set of experiments you run post-launch.
With your comments you're part HN is descending into a circular firing squad of virtue signaling. These guys shipped something that could help a lot of people, over time they can improve their onboarding flow, lower cost.
Is the most remarkable thing about a really cool CBT tool for ADHD really that they have a standard trial flow?