...but now Stratis is not one of the popular project.
Because it's a scam.
I'm not trying to defend the project, but instead I'm trying to look at Stratis from an objective standpoint. A professional digital asset investment fund like Alphabit is not likely to invest in a scam. You can bet that they are doing thorough research before putting investors' money in any endeavour.
Second of all, check the Stratis github. The dev team is making progress. Is it significant? - You need to decide.
Personally I think the direction to building DeFi apps/platforms is in sync with the market trend, therefore it is a good thing that they are emphasizing development towards that end.