Free software is Free (and free software is free, libre software is libre, …, where the free/Free/libre/OS/… distinctions are relevant). That does not guarantee continued maintenance for decades, and to expect such is the sort of entitlement that puts some people off sharing their work and playthings.
Can you explain what that misunderstanding is?
Deprecation is just a tag. You don't have to respect it. And if you want the project to continue, you can freely fork it.
Free software is Free (and free software is free, libre software is libre, …, where the free/Free/libre/OS/… distinctions are relevant). That does not guarantee continued maintenance for decades, and to expect such is the sort of entitlement that puts some people off sharing their work and playthings.