The number of pips captured on trade copying depends on when they connected, whether they stay connected continuously, spread from the broker they are using, and also slippage. It doesn't necessarily mean replication is poor.
They also have the option of following my strategy on other platforms if they think they can profit more that way.
This is just part of trade copying, and some people prefer it over other methods of following a strategy so that they have more control over their account, how they use their margin, making other minor adjustments along the way.
The track record for the strategy those 744 investors are following is actually 75 weeks long once the complete trade history is processed and migrated. 17 weeks is all that came over due to quote tickers changing with Mt Cook in Sept 2018 due to ESMA adjustments this broker had to make, but soon Zulu tells me the whole track record will be migrated.
Many of my investors have been given my background on the Zulu Newsletter, on their blog, and they can view my complete trading history and biography online easily. This has probably been a factor in me picking up 744 investors in the first 2 months.