Open-source bounty (campaign)

As there are different websites organizing bounties for open-source software from individuals, I would like to ask if you have any experience with one of them? Would it make sense to support specific issues on github (like apps to add) to attract maybe more software developers to join the syncloud project? If all users would spread small amounts of money, more apps could be added quicker, do you think that’s realistic? Would it even make sense to establish an own syncloud system as 3rd party organizations claim some fees?

We would only be happy if such a thing can work as long as someone can actually make it work.
Feel free drive that and I will be happy to support.