I am no shill for free-wallet nor do I claim to know anything about their legitimacy but I did use minergate a few years back and that did end up with me using freewallet.org app on my phone for the transactions on minergate for mining rewards.
I used the wallet from Jan 2018 with last transaction being June of 2020.
I have sent/withdrawn the following currencies: BCC, BCHSV, BTC, DOGE, ETH, LTC, XDN, XMO, XMR
I have had nothing go awry outside of an issue where their mobile app does not show the same balances/currencies as their website does.
I never put large vast sums in it - I simply used minergate to test gpu/cpu and an asic once or twice.
other than that, I have never lost any funds to freewallet.