Burstcoin (BURST) used to be interesting for me because it is the only Proof-of-Capacity (not necessarily Proof-of-Storage) mined cryptocurrency, which is energy-friendly. Hard Drives used for mining can easily be converted for other purposes by simply deleting the "plots". However, its price remained the same while the amount mined gets less over time, so most people who used to mine it stopped. 🤔