I missed this coin in the early time
No you haven't.
SPR could be trading at 10x the current price by the end of January, with 500+ Spreadnodes providing anon for those that wanted it and a better return than mining for those that ran them.
There are many reasons DRK has been far more successful in the market than the CN clones (which are the only other anon solutions, everything else is closed source bullshit and vapourware) or just about any other alt, and technicalities aside, ironically enough the main reason IMO is that Evan Duffield has always been 100% open, honest, and trustworthy, and has done the right thing for the long term, damn the current price. DRK has had some tough times, but its supporters
trust the developer, not on blind faith but because they have been given real reason to do so. That's a rare thing in our little playground. That's invaluable.
You also need to stop thinking of the crypto scene as the market. It isn't. You shouldn't give a damn about it, you should care about the real market, big money, the real world. The real world can use and rely on a truly decentralised currency. It is never going to put money into a currency that relies on a few centralised pools for its blockchain security. Ever.
The DRK code fixes one of Bitcoins weaknesses, but Mr Spread's pool-denying solution fixes the far bigger one: centralisation.
BTC will never fix it's centralisation problem, big money will always laugh at it for the flawed toy that it is and walk away.
SPR, uniquely among PoW coins, has the potential to remain resilient and functional against a serious adversary. That has real value, it was the original selling point of Bitcoin, but Bitcoin has long since abandoned the concept.