Good questions. I think the key difference will be in the topic/market focus. The creator/artist market (e.g., Patreon) is different enough from the researcher market that I don't think people browsing Patreon (on average) would be interested in backing graph neural network research, for example. From there, it will be about tailoring the platform to researchers' (and their backers') needs which could include a bunch of things like facilitating connections between other researchers and "advisors", (hopefully) being able to provide cloud/GPU discounts, having different standard rewards (e.g., a backer's name listed on a paper), etc.
If there is enough interest, I'd definitely want to expand to other areas, but AI/ML seemed like a good place to start since it's where I'm most familiar and there's not much overhead in terms of needing lab space, etc.