PMC technology enables your phone to mine tens of crypto assets independent from linking commercial servers. For example, any phone can mine London PMC, that is exclusive for London in the PMC world. Londoners will see the coin natively living in the app and use them for payment, chat and advertisement. The global phones network will secure and grow the city blockchain collectively.
Yes its already happening, but do you think this will work out? Considering phones' resources while running such a blockchain.
After nft's, there's this metaverse. Phone mining is not next after them because they are already there even before. It's only starting to get hype because of that pi mining but people shouldn't believe on that as it was a scam. There are other legit phone mining app like electroneum but I think they aren't that profitable and you can only end up paying more for the electricity for your phone maintenance as it will likely be damaged from continuous use of the app.
If you want to earn a crypto then there are more better ways of doing it. Crypto trading, investing, working online as a freelancer can be a few examples. You can also do bounties and airdrops.