The MT5 historical tick data are downloaded from the broker, MQL5 Cloud network contributes with the computing power needed to speed up your optimization.
I haven't read this somewhere but my logic tells me so.

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When using the MQL5 Cloud Network for optimization in MetaTrader 5 (MT5), I'm curious to know who provides the symbol history data downloaded by MT5 during optimization: the broker or MetaQuotes?
Does the data come directly from the broker, reflecting their server's historical price movements? Or does MetaQuotes offer a centralized data source for optimization?
Knowing the data source is crucial for assessing the accuracy and reliability of optimization results. If it's from the broker, strategies will be tailored to their specific market conditions. If it's from MetaQuotes, it implies a standardized dataset across brokers.
If you have any insights or official information on the MQL5 Cloud Network data source, please share. Thanks!