Lightning is pretty complicated, it isn't quite as clean and simple a protocol as Bitcoin. Bitcoin uses a broadcast protocol whereas lightning needs more complex routing and nodes need to lock-up funds via an on-chain bitcoin txn to make a connection.

The internet itself at the backbone/isp level is a decent analog as ISP peering can be complex and often involve cost. It took awhile to get BGP right and determine the right cost metric for selecting a route.

There don't seem to be any blocking issues though and many of the large wallets have announced that they will be supporting it eventually.