Data Reliability

I got the information that a protocol had over 150 billion trading volume and record high TVL.
But through Defillama, I cannot verify the information.
Which one is correct?

Each aggregator may have its own methodology to calculate figures like TVL, Volume, Revenue or Profit etc. This is true, and but also can be an excuse to avoid any potential legal or illegal risk or attack.
Defillama and many crypto data aggregators have the attitude that they follow trends, but may have issues, errors or different methodologies or criteria that users should accept.

Even with recent rapid crypto adoption to mainstream finance, still crypto side doesn't have clear its own standard for data recording, analysis and validation. With this grey area or time, many aggregators do collect and analyze data according to their own interests and preferences. This lack of standardization will lead to discrepancies in reported data, making it difficult for investors, users and institutions to make correct decisions.

TVL.
From a certain point in time, the word "TVL" started to be used.
I clearly remember that a big fan for LUNA chain insisted Luna was the best chain regarding its TVL.
At the time, most of the assets in LUNA chain consisted of an absolute high amount of LUNA coins and a few others. So, when the LUNA price dropped, the TVL fell seriously.
So, I started to doubt that TVL does have any meaningful worth to measure the real value or potential growth of a chain.

As the crypto space develop, establishing reliable and consistent metrics will be important for attracting public adoption.
I think as crypto evolves and has more users from legacy finance and web2 area, it is more required to have clear criteria to measure its performance, growth potential, real value, scalability, decentralization, and public adoption ratio etc.