i have been scrolling down the bounties section and seen so many projects related to Defi and Bitcoin but i cannot understand how the new project like Defi is giving a hard time to BTC and even to other altcoins like ETH and ripple and many more?
every post and campaign i am seeing is about Defi and its making more money than others/
why?

You said the Defi project made Bitcoin difficult, Can you explain in what ways the Defi project makes the bitcoin difficult.?
The Defi phenomenon is an increasingly advanced development of the crypto world. After ICO and IEO, now Defi is dominating, and until now the hype is still there in the defi project. So it doesn't make a sense if Defi tries to compete with Bitcoin, because it will never happen.