Hi @everson_50,
I have a couple thoughts for you around this.
First, as to the alt-text character limit, there are many systems that seem to suggest that alt-text should be 120 characters or less. I haven't been able to find an exact number in any standards, so I think that 120 character thing is more of an interpretation than anything. In reality, I think the alt-text should be as concise as possible while still fully describing/conveying the importance of the image to someone who may not be able to clearly see it. For some images that's easy to do in 120 characters, for others it could take 1000 characters (or maybe even more), especially in an academic setting. The accessibility checkers can't really figure out the context or complexity of an image, so they just flag anything over a certain character threshold and leave it to you to make the final decision as to whether a change it needed or not.
With that note out of the way... I agree that genAI really has opened a can of worms for the other AI acronym (Academic Integrity). Unfortunately, I don't think there are any real simple fixes for the situation right now. Putting your question text as an image is likely to cause more issues for students taking the quiz than anything, and honestly won't stop students from using modern genAI tools to get answers, as they're usually able to easily read text from a screenshot/image. In my personal opinion, there's really not a way to guarantee academic integrity on an online environment. There are proctoring tools (or using video conferencing software to approximate those tools) and lockdown browser tools, but all of those have their own caveats and issues, and can be circumvented pretty easily by tech-savvy students. Then there is the idea of assessment redesign, which is probably more likely to be effective, but requires a lot of work and thought, and still might not be "AI proof".
I think on some level we're in the middle of a teaching and learning revolution right now. GenAI is putting information at students' fingertips, but that info isn't always accurate and students don't always know what to do with the info. We'd like to continue to use the same teaching methods that have worked well enough for years, but genAI is making that a harder... I always try to keep in mind that even before genAI (and the internet), academic integrity has always been an issue for educators. Some students have probably been cheating since the advent of education, but certainly not all of them. GenAI may be enticing more students to do their homework or exams in ways we'd rather they did not do, but I don't know that there's a way to turn back the clock at this point. I also think there's more of a "feeling" that online courses have more academic integrity issues, but there is not a ton of hard date to back that up (and I do realize it's a difficult thing to get hard accurate data on)
One popular move right now is to deliver content online, but have exams and assessments be in-person. This could potentially help reduce academic integrity issues, but as I said earlier I think most educators will admit to having issues in-person as well. In-person requirements also remove some of the flexibility that students today (especially in higher-ed) want and need, so while I don't know that it's a universal solution.
I hope some of the ramblings of this Canvas admin help a bit.
-Chris