Lightning has grown beyond its two original creators and now has a healthy community behind it. Worth mentioning are Rusty Russel (iptables, netfilter, some network layers of the Linux kernel) and the fine folks at Acinq (acinq.co).
"Usable" is a massive stretch. The only way most people will ever be able to use it is through a custodial wallet, so it's right back to bank accounts and centralized exchanges.
But the whole thing is a distraction anyway. The majority of transactions happening off-chain means that Bitcoin is an utter failure at everything it ever set out to accomplish.
