The matter is very simple:
Is dealing with riba part of your work? If yes it is haram. If not it isn't.
By part of your work I mean do you accept it or deal or negotiate about the interest etc. Or are a witness of this negotiation? See also Is indirect help to a riba business haram?
Islamic law doesn't preclude anyone (i.e. banks) from providing a service (i.e. assistance in purchasing a house) and making a profit (i.e. 100k) therefrom. It only regulates the acceptable means by which one may do so.
Those who consume interest cannot stand except as one stands who is being beaten by Satan into insanity. That is because they say, "Trade ...
Read the Islamic ruling here.
If I were you, I'd announce it for a year (in both Arabic and Indian language - asking for help from native speakers as needed) and if no one claims it then get it exchanged for Qatari money and give it in charity on the owner's behalf. If the owner later shows up, give him an equivalent in his money back and the charity will ...
Firstly, what you're promoting, i.e. links to paid games, is haraam. Because, it is piracy. See this:
What is the Islamic stance on Internet piracy?
This alone makes the income from promoting these stuff haraam.
But to address your question, if the content you were promoting were permissible and the ads on the link shortener did not go against Islamic ...
رهن is permissible as proven from the Quran and Sunnah:
وإن كنتم على سفر ولم تجدوا كاتبا فرهان مقبوضة فإن أمن بعضكم بعضا فليؤد الذي اؤتمن أمانته وليتق الله ربه
And if you are on a journey and cannot find a scribe, then a security deposit [should be] taken. And if one of you entrusts another, then let him who is entrusted discharge his trust [...
As per your description of the system, what you're referring to comes under competitions with prize-money. This is haraam except for few cases:
Al-Tirmidhi (1700), al-Nasaa’i (3585), Abu Dawood (2574) and Ibn
Majaah (2878) narrated that the Prophet (peace and blessings of Allaah
be upon him) said: “There should be no (money) prizes for competitions
The hadith even if it was qualified as da'if on sunnah.com has been quoted (at least partly) in several other hadith compilation such as a second narration in Jami' at-Tirmidhi, in Sunan ibn Majah, in al-Bayhaqi's as-Sunan al-Kubra (here in Arabic, where he points that the issue is Hamza ibn Maymoun who has been qualified as da'if by Ahmad ibn Hanbal and ibn ...