Moneybox on the Internet

Probably everyone faced the problem when you need to accumulate a certain amount to buy your dreams. It was? It was.
Does everyone succeed? Personally, I do not. When I know that there is a lot of money in that “pig”, and in my pocket it is empty, the subconscious mind pulls out a couple of rubles from there. For myself, I found a way out - I give money to my mother or friend and strictly strictly forbid giving them to me until I have accumulated as much as I need. Works.

So here. What if you make such a service where you can throw money? We save money in service wallets. The service does not give money until the required amount is reached, naturally set by the user. Or until the day comes X.

Interesting opinion of users. How interesting and feasible can this be?