I actually disagree on both whether this is truly vendor lock-in and on whether this is fair to bring up, but honestly, it wouldn't change anything regardless. The reality is that solving people's problems is what wins you customers, not pleading for fairness. As unfair as it might be, that's the reality of the situation. If we want Adobe's hold on the market to be released, we (and they) need to deal with the reality of the situation.