Lending without security is risky, especially if you look at it in the nature of an asset that is irrecoverable. Capital gains only apply after a certain slab of income, and further, as already pointed out, you would need the money irl. So, an easier way would be to continue holding your btc and trading on it on the platforms that you have mentioned, while liquidating some now and them for maximum benefit. This will also minimize your risk towards the exchanges themselves, which may cease to exist or be seized by the State.