This is not due to lobbying by Intuit. Their money isn't worth that much. What keeps this from happening in the US is Grover Norquist.
Do you really believe this? There seems to have been quite a bit of lobbying by Intuit. https://en.m.wikipedia.org/wiki/CalFile
Yes. Go look up Grover Norquist. Intuit could give millions of dollars to the coffers of politicians and still not be anywhere even approaching the influence of Norquist.
This is the first time I've heard of this theory and Google doesn't seem to have heard of it either... can you expand? According to Wikipedia he's a flat-tax supporter.
Tldr: conservatives who are anti tax want to make taxes painful to make citizens against them. They believe that simplifying taxes would make it easier for the govment to raise taxes, which they’re vehemently against.