I used to start my projects on Heroku because the first few iterations of the prototype can run on the free dynos, then hobby tier for the first production, better database when needed, and so on — slowly growing as it should be.

Now I will either replace it by some DigitalOcean droplet or Fly.io or Railway.app or whatnot. Whichever makes most sense for the growth of the project.

I am pretty sure some of my clients will stay on Heroku just because it's easier and they already pay for most services (so no free tier already) but it means NO NEW clients are coming to Heroku from me.