I disagree, "cloud" is extracting basic Linux functions into as many proprietary services as possible because businesses would rather deal with obscure YAML configurations than ever having to touch Linux-proper.
I'm sure the vast majority of businesses can handle ~10 min of scheduled downtime per week necessary to restart everything.
Now, database replication, not having to waste time to run/maintain clusters (be it Kubernetes or Elastic stack or something else), that I believe is well worth the money to offload to someone else, but even there you can get a much cheaper deal with someone that's not one of the three big cloud providers. I will also concede that Firebase is genuinely nicer to work with than its alternatives (Supabase very much included).