no land claims

No. Anarchy is a broader stance about rules and enforcement. No land claims only means there is no chunk-based ownership system. A server can still enforce rules around griefing, harassment, or spawn damage, or add narrow protections like locked containers.

Often, yes. Without claims, most builds are physically interactable unless the server adds separate protections (for example, container locks) or enforces anti-grief policies. Treat anything you place as potentially lootable and check the specific rules before investing heavily.

Staying hard to find and hard to profit from. Hide or bury entrances, avoid obvious landmarks, separate your visible base from your real storage, and keep backups. Many players travel via the Nether to reduce Overworld trails, and rely on ender chests for the highest-value items when available.

It can be, but big builds are a commitment, not a guarantee. They last when a group can defend them, the location is genuinely hard to locate, or the server culture discourages wiping. A common approach is a small replaceable setup for routine play, with larger projects only once you have allies and redundancy.

By the server's enforcement style. Some communities use staff review and limited logs to apply rules about raiding versus griefing. Others accept losses as part of the format and let deterrence come from alliances and retaliation. In practice, chat history, reputation, and patterns of behavior carry more weight than ownership records.