Aside from regulators moving into crypto bigtime, there are community initiated shit being set into place, look at this for example:
https://coinmarketcap.com/data-transparency-alliance/
CoinMarketCap Forms Alliance to Tackle Concerns Over Price Data Integrity
There are exchanges suspect of faking volume and shady shit, but I'd say these are pretty legit.
Here this guy even tracks the "real" Bitcoin volume,
https://www.bitcointradevolume.com based off the Coinmarketcap alliance exchanges.
Everyday things are improving
