With the much anticipated recent launch of Cosmos blockchain for interoperability, there are now over 70 projects using PoS to some extent, and they have seen 40% of their supply staked on average. According to Diar, almost $4 billion is staked, nearly half of it with EOS.
Competition though is likely to get even more fierce as delegators seek the best bang for their buck. A half dozen known blockchain PoS projects are set to go live later on this year. And high-profile networks are still in the works (see table below).