I've seen some negativity about Heroku, specifically around their staffing and investment since they were acquired by salesforce. Interested to hear general sentiment from the community. I would also be interested to hear about alternatives.
Render is the new Heroku. I'd look at them, also maybe Fly.io for a bit lower-level approach, as solid alternatives to Heroku. Generally cheaper as well.
I would host it in a dedicated server in ovh and hetzner. Saves me tons of money and probably even time too as i dont want to learn the whole Heroku system