Growing pains are never fun. It doesn't mention (at least that I read) if they're using HashiCorp Open Source or Enterprise. Open Source is great and I owe my career to it but they might be hitting the scale when the Enterprise features and support start to be worth the price.
I've only used Fly.io for a personal app but I think it's a great option so I hope they keep growing.
Agreed, any application regardless of language or framework can age poorly. I've seen some pretty solid "long running" Rails applications that were just maintained well.
Mostly Quiver (or Boostnote) with the files backed up to a remote git repo. Added benefit of being a format that is not locked in and can be parsed out later if required.
I found a weird issue on a friends phone when I suggested they download it for iOS. It says "This item is no longer available". They were able to download other apps from the store. When emailing Signal support they said nothing was wrong on their end.
Still havent figured out why my friend cant download Signal from Apple App Store.