On sites like CrossValidated (but I guess this applies also to the math sites etc.) we often have users who post math formulas as pictures, rather then using TeX formatting that is supported by the platform. Some of the users are unfamiliar with TeX, some just lazy, yet it would be nicer to have everything in TeX (it would be also helpful for the visually impaired users, as we have such users).
This could be easily solved: there is the Mathpix service (and an R package) that is able to transform pictures (including the handwritten formulas) to TeX markdown. I don't know if it scales, but it would be used only by some users, so scalability is probably not that big problem. It could be offered as a button "transform this to TeX" or something. The only problem to solve is discovering if the image contains math or not, but this is a far easier problem then the one that is already solved by Mathpix.