As someone in a number of non-corporate/dev Slacks on the free tier, I do wonder when/if Salesforce will tighten up on those as well. There are some I know were just for organization during a one-time event...
Which coincides with about the last time Heroku was relevant/competitive. This is just an example of the parent company tightening the screws some more (see also [0]).
This is just wrong info. Search HN comments from ‘craigkerstiens, an early employee. Significant innovative product development continued for a few years after the acquisition.