Well, it's look likes a fomo to me because it'll vanish just like other trends when more public will attract into Defi and get low reward as it's the main point for all the newcomers who get interest into defi. Also i see many of the well reputed Top crypto projects are shifting to Defi catagory. Recently, Tomochain get the Defi tag on CMC and all people get in fomo and buy tomo.As a result, tomo get an instant pump. But the major coins won't be effected , imo.
The idea cant be sustain for a very long time time, creating scarcity by reward to increase price but when the time of sale comes the rate of price dump will also be very massive. FOMO is always making money for some side of the market and everyone is trying to be part of it, especially the top exchanges, Listing those coin with very short notice.