Why is the price keep dropping after the tech launch, I hope people are not taking profit to invest in Darcus, since the some Stratis team members are involved in the project too, this is just my own theory
What are you talking about? STRAT is still x5 its ICO price. I wouldn't call it a drop unless it is below ICO price.
STRAT is a very good project but investors can be happy with x10 times, x5 times, x3 times or even x2 profit on their ICO investment. No way to tell.
Not only 5X, it is more than 9X now, ico price without bonus is 1129 sat,

All time high was 16X, the most profitable ico project in the year.