I don’t have time to check all the other etfs. It’s easy to check, usually the AUM is listed as soon as you google the etf name so it’s not hard to track.
Yup, Purpose ETF (BTCC) is showing to have assets of 2bn: https://ycharts.com/companies/BTCC.B.TO/total_assets_under_management, assuming this is presented in CAD, that would be around 1.5bn in real dollars.
I've checked a few random ones, some of them seem correct but few of them were quite far off from what's stated in the table. So either bitmex researcher(s) didn't do a great job, or there's something I'm missing.