Its not possible to have 100$ income a day unless if you're professional, skillful, has many work and your business is doing great, then it might be achievable. Being a merchant is not going to be easy, it is risky as well because you can encounter a scammer. If you really want to earn 100$ per day you need to improve yourself not only as a merchant but also learn to have a skill that you can use to maximize your earnings by offering services.

As per the above comment there are many things you can do to earn money in crypto it is all dependent on the skills you have. You could find a list of certain jobs either temporarily, remote or permanent on many sites.

I'm sharing two of these so you can see the different options: https://jobs.dcg.co/ and https://crypto.jobs/

Good luck

A forum signature campaign pays around $ 1,500 a month.
You need to be a trader between Paypal-BTC and trade on HitBTC with some free tokens to get around 1000
You can achieve this amount, but you need to wait about a year and it will succeed.
other 500 dollar you can earn it from trenting your avatar and selling some cards

The only thing i can think of is becoming a campaign manager or doing signature or bounty campaign's that earns you $15-$30 a week, it's not bad as a side job while you're trading.
Else if you have other skills such as SEO, link building or social media marketing you could offer those in the services section.

If you wanna earn $100 daily day you must have money for trading or investing, I think with free way looks hard to earn $100 in daily day, with bounty or airdrop project we must waiting minimum one week to receive payment and signature campaign only for higher rank could earn about $70 every week. Your expectation too high to earn $100 every day without have money or free way.

Without having skills in trading, it is difficult to earn $100 daily, especially if the market is not unstable like today. But I believe that it will be easy if the market is at the bullish trend and make almost all coins can go up to a higher price. But we know that the market now is not good and that can make us feel difficult to earn $100, so I think it is better if we can still make money from any amount because if we can get the money for more and more, that money will be bigger too

Wow! $1500/month, what kind of signature campaign you are talking about here? Even the sure thing, btc paying campaign, you will be lucky if you will participate in a campaign that will give you $50/week and most of the time, you should be Hero or Leg. For alt paying campaigns, I don't think you can get that amount every month as most of them, the payment is delayed and you have no assurance when will it hit in the exchanges.

If you invest on high end hardwares then it will possibly happen but this is not really possible on any cloudmining site since as you said a lot of them are scams and no one has proven yet their legitimacy together with insights of their rigs, It's best for us on not to look on cloudmining since it is proven that it always scam people so best to find it on another ventures although I cannot guarantee that we can earn with it passively but still we have a safe chance to gain a profit with it(I'm suggesting trading here guys).

Merchant business is not an easy one to do. Normally how it’s being done where I live is that the merchants have a particular rate they sell for a dollar. So, everything is being calculated by a dollar, and then when you make payment they will send the amount to you. That means they are trying to put their own fees. This is really not something I will explaining to you. You may decide to be charging a particular fee for the services you’re offering or just ask those that are into it and they will explain to you how it works. And of course, it will require that you pay them to get a knowledge of how it works. But first get to know if it’s worth diving into.

I like to suggest people not to think about bitcoins or cryptos in general like a magical money making resource. If we are able to make $100 daily with our day today's life things then we can make with bitcoin as well. I mean nothing will change just because of we are having bitcoins (except its huge ROI in long term holding) on daily basis.