i need info or links to trusted bitcoin mutual donation platforms where i can double my bitcoins and increase my btc gain?
Its not Donating if you are earning profits back ! lol
If you want to double your bitcoins, there is no legit way to do so. Do not invest in any ponzi sites, as they are pure scams.
Only your hard work can earn you btc, or you can just buy some bitcoins to double them !