> Open access publishing is the new business model that is more lucrative for publishing industry and it is basically a tax on research activities but paid to private entities and mostly paid by taxpayer money
In addition to what @tokai said, I think it's also important to keep in mind that before Open Access the journal publishers charged subscription fees. The subscription fees were paid by universities and that was also likely largely taxpayer funded (e.g., using money from overheads charged to grants).