Scientific evidence hasn't proven yet that there is such thing as free will, but it is harder to prove that something doesn't exist than that it does. The question is: does it actually matter? As long as people keep the idea or the illusion that there is such thing as free will, it might help them feel like their actions and choices do matter. I can imagine that having the idea that no one has free will, not even you, might give people some sense of powerlessness, like it doesn't really matter what choices you make, because it's not really you who's deciding it.
You can assume that free will is only something that happens consciously, something we should be fully aware of. As scientific evidence showed that all choices they researched arise subconsciously, you can conclude that free will didn't exist in these cases, or at least if you use this assumption. This was based on brain scans they made while their subjects made these choices. But don't do many other types of cognitive processes (or at least part of it) take place subconsciously? When we first learned reading, most of us read words letter by letter to understand what word we were reading. Now that we are older, we don't read like that anymore, not even when we come across words we've never read or heard of before. I must admit I haven't checked any scientific research on this, but doesn't this suggest that as we get more experienced, a part of reading start happening subconsciously, because we simply don't NEED our full consciousness with it anymore?
If we keep this in mind, we could suggest that the subconscious part of decision-making (and therefore the thing that makes us lack in free will) is based on the same process as not reading every single written word letter by letter. Just like when it comes to reading, people need to process a lot of information in order to make a good decision. If we had to handle all that information consciously, we'd become slow, just like a six year old spending eternity trying to read a simple sentence. In order to make decisions faster, it might come in handy to process some of the necessary past experiences we had subconsciously. You could be conscious of the past experiences you're using, but you're not, because that would be impractical.
So I personally think that the subconscious part of our choices and decisions could very likely be part of our past experiences we could be conscious of, but we aren't at the moment, because we just wouldn't get anywhere in life if we were. (Except in cases where we use our fight-flight response and other reflex things, but that's basically evolution and our species as it is wouldn't exist without it.) Does that imply no free will? Maybe, but maybe not. We could also redefine free will as the ability of an otherwise completely sane person to wholeheartedly make stupid decisions yourself without the influence of others, knowing this decision is really stupid and unsuitable to the situation, getting little or no support by others and afterwards still being aware that it was you and no one else who made this decision. Not saying that anyone who didn't do this doesn't have free will, but I personally prefer this definition.
Like an ESFP voluntarily posting something to this NT fuelled thread. That sounds like free will. Woooooooo