If you cant invest money. Try investing your time. Its business not miracle. 2 hours per day in my opinion is too short. But if you have skills and talent why not. Try joining sognature campaigns but it wont give you 1btc per month.
I agree with your words, and this is what I'm doing now, although it takes a long time to get 1 bitcoin but I'm really happy to be in this forum, I can get bitcoin from campaign and science about cryptocurrency world.actually, signature campaigns can give you 1 or 2 bitcoins in a month. the possibility is there and in the past few years, it has proven to be possible. But its not a guarantee for all signature campaigns.
Firstly, you gotta be a Hero/Legendary so that you will be earning more than a Member can earn. maximize your earning power. Oh and of course, you must not have a negative reputation. so no trolling and avoid negative conflicts. just stay on the safe side by helping people, answering questions, offering your opinions, etc.
Secondly, depending on how hot the altcoin is, once you have earned enough and when it gets listed on the exchange, you can sell it for quite a sum. 1-2 BTC in a month is very possible.
I think even though we have a Hero/Legendary rank it only produces about 0.1+ BTC per month. So getting 1 bitcoin per month just from a signature campaign I do not think is possible unless you have special skills like being a campaign manager or a logo designer or signature etc. that makes you earn extra income.