I would not be opposed to viewing static adverts with a link to the product during an install, or even an uninstall process. However attempting to or even asking me to install software I know to be tracking and crapware is unacceptable. I like the Open Candy model, do not download the software until you accept. On offer, one advert, and then just say no or accept. Once the user accepts, the software is then downloaded.
The way Freemake has it set up is already downloaded and selected, ready to deliver it's crapware payload, hoping the user will hit next. Most folks now do just that, not paying attention.
I think we, as users, should take a stand, and not accept this way of doing business. If it is advertised as free, it should be free, no strings attached. Especially if the program is built using Open Source, Free, Or GNU software. If the program is advertising/adware supported, it needs to be made abundantly clear, and a new category should be created so that truly free and great software can be differentiated from it.