I running a hobby alone, and I am fine with the free plan. I don’t need too much. The only thing that I miss is the Gantt chart.
Given that this is the only thing I need of the paid plan, I would gladly pay 10€/Month to upgrade and get it - I don’t really need any other additional features - but I won’t pay 30€/Month only because I need a Gantt in addition to what the free plan currently offer.
If they add the possibility of adding ONE seat only I think they would get my subscription. Otherwise, no, sorry. Unless they won’t add Gantt charts in the free plan 
My workaround now is to use Date column to remark deadlines and give up a visual representation of timelines.