Bitcoin is actually the closest to solving the scaling problem, because it has Lightning Network and while it is not yer released officially, people already use it on mainnet. Ethereum's scaling solutions are in much earlier stages of development, and other cryptocurrencies that claim to have solved scaling are so centralized that we shouldn't view them as competitors of Bitcoin - they are entirely different products with different value proposition. This is one of the reasons why Bitcoin is doing so well and altcoins don't.
this is what is lighting network -- this will scale'

? its second layer payment protocol, need setup and other things...and
ssentially, the Lightning Network allows two people to transfer cryptocurrency directly, rather than via the main Bitcoin blockchain.
Say David and I are regularly paying each other back in Bitcoin for the beers were always buying each other. Rather than paying each other back directly, using conventional (and slow) Bitcoin transactions, we could set up a Lightning Network payment channel.
When we setup this channel, what were actually doing is setting up a special kind of wallet that only we can access. Initially, we would both put some Bitcoin into that wallet and use those funds every time we want to quickly send some coins to each other.
Every time I buy David a beer, he can pay me back quickly and directly with minimal fees using this channel. When we decide to close this wallet our final balances are settled using Bitcoins Proof-of-Work blockchain.
Effectively, the Lightning Network operates by generating IOUs between the parties of a payment channel. Technically, no one actually owns the money held in that channel whilst it is open.
if few dags weakness solved its the next bitcoin and top marketers need to be behind this to make it viral because the hype and bullshit and scam will hide this gem, then* the source code forked and new coins which all of them are very scalable and decentralized and secure + quantum resistance...helll this pizza taste very good