Yes, everyone is trying to get their hands on the DeFi hype and make some money in the process, many developers of those dead coins are reviving their coins and hoping they can again make some money by making their coin DeFi compatible as a lot of projects had huge success with the same plan in the recent months. This is all because of people who are buying their coins and are making a way for others to do the same because when a single idea makes money for a scammer then he tells his friends and they also try to do the same and in this case the same is happening.