Blockchain is useful in very limited circumstances. Namely, when:
1) The central party running the website accumulates value from its growing network but doesn’t want liability for their database being hacked and corrupted (eg having someone give themselves a lot of votes or internal credits), or prevent the fear that they won’t pay out (eg when PayPal froze accounts for the tiniest reasons, or Lebanese banks, or Canada, etc.). In the past this was partially solved with reuquiring middlemen to post surety bonds in every state and registering as a money transmitter. But many marketplaces (eg Etsy, Ebay, Kickstarter, Uber Eats) today operate in a gray area when they do payouts.
2) When a community (whether local or global) are engaging in some ongoing collective action and want to make sure everyone can verify the rules were followed, without relying on fallible middlemen. The Factory Pattern allows them to easily verify that the publicly audited software was indeed not tampered with. Examples include: contests, elections, roles and permissions, escrow transactions, memberships with recurring subscriptions, disbursements to approved entities etc. In the past we just had bank accounts be a block box for most investors etc.
