It's more about Heroku dropping free and low-cost plans, which is them demonstrating that they don't currently care about three low end of the market, more than any specfic feature.
Also the absolute disaster with security they had just before dropping free tiers, and the awful response which took months to even acknowledge some kinds of data (such as pipeline keys) where affected. [0]
[0]: https://github.blog/2022-04-15-security-alert-stolen-oauth-u...