I'm pretty sure that worrying about your hosting provider going out of business is one of the least important things to think about when you have a startup that

I'm pretty sure that worrying about your hosting provider going out of business is one of the least important things to think about when you have a startup that's still trying to build its business model. And seriously, not everything has to be hosted on k8s, not everyone has to use Terraform, it's ok running your application on Heroku, DO or some other hosting. If Heroku goes out of business, you'll have a few months to preapre a migration plan. It's ok to handle it then, right now there are probably more important things for them to do.