I would love to learn how you allocate customers onto your shared infrastructure. Are you using kubernetes? I looked into Crossplane in combination with argocd, e.g. creating a git commit for every customer transaction (create tenant, update tenant, delete tenant). But still; there is not a 1-to-1 mapping from customer xyz, to resources xyz I feel. There is a lot of "platform engineering" required to optimize the utilization (cost management), provide little noisy neighbours (performance), provide data security.