[donmcronald]

Free tiers are just another type of market research where the company is collecting data to determine the stickiest features.

$8 (or less) per month to keep using the feature with competition (sending). $35 a month to keep using the feature without competition (receive filtering and forwarding). Is that a coincidence?

[chiefalchemist]

Features and bugs. The free tier is closer to unpaid beta testers, except the free tier comes with minimal support.