Digital money such as Bitcoin is known to have serious problems, where they rely on electrical energy
WHY?
why is using electricity a "serious problem" only when it comes to bitcoin and millions of others that are using electricity (most of which are actually wasting it) are never talked about?
Honest Mining's Chief Executive Officer, Lawrence Samantha, said that around 20 percent of companies that are in this business have moved to an option called proof of stake.
nobody chooses PoS for any reason other than what Franky said: to make free money.
also you are missing the point that all those who choose PoS are doing it because they know that their coin is useless and because of it nobody will ever waste their time "mining" it so they want to make it as easy as possible for the network to exist
not to mention that PoS is also flawed!