I will donate the $100 to charity as well - I don't intend keeping it and I'll convert the Bitcoin to USD $
I appreciate it's a weird request, but I'm looking to do something fun and to challenge myself for a good cause - can I get Bitcoin by doing advertising and promotional work and use the amount raised to help a good cause?
And why not keep Bitcoin and gain experience first before investing in it? It is possible that through the $100 that you invested in Bitcoin, you can make good profits through it, and then you can donate part of it to a charity and part of it to keep for yourself; in this case, the benefit will be dual, it's just my opinion for you because it seems through your words that you do not know the great profitability of Bitcoin.
I appreciate it's a weird request, but I'm looking to do something fun and to challenge myself for a good cause - can I get Bitcoin by doing advertising and promotional work and use the amount raised to help a good cause?
Yes, you can, but you need accounts on social media that contain thousands of followers and be real not fake or bots, or an account with a good rank here in the forum, or you can, if you have skills and experience in any of the known required fields, you can create your services and publish them on the marketplaces for services sites.
The idea of obtaining $100 in BTC is easy for an experienced and skilled person, but you, being a beginner. Suppose you do not have any portfolio of previous work or skills. In that case, it will be difficult at first to take this amount, but learn and develop your abilities and skills, and with time you will be able to obtain this amount and pay it to charities or whatever goal you want.