Splinterlands, it only creates Hive accounts for people who buy the spellbook (10$).

It's probably for the best. There's no point making accounts for users that are not invested enough. Accounts are costly to create.

they need to like where they land

InLeo is probably the best. We should have a quick way to explore other Hive Dapps from from any Dapp. A quick like to https://hive.io/eco is a start.