I did not investigate BitGo a lot but I came across this name as the custodian of custodial wallets ... a lot. Searching WalletScrutiny I find at least 29 reviews that mention it.

You know what is worse than a custodial wallet? All custodial wallets using one custodian. Now the regulator only needs to strong-arm one company. Or to go a step further - what if BitGo gives the best conditions to companies not because they have the best operations but because they are setup to disappear with the funds?