It seems to me that she says:
Was ist, wenn ich dir 500 Euro gäbe, würdest du DASS dann tun?

I’m not sure if it really helps, but I do believe it could help some learners, so should I always say when I find a typo?

Yes, there was a difference. I corrected the text into “, würdest du das tun?” I corrected another slight difference.
You have to use “das” not “dass” in this case. “Dass” is a conjunction. “das” is a pronoun in this case.
Yes, let us know if there are typos, escpecially in the beginner content.