Odd choice of example, and I really have to disagree on sherlocking.

First, why the example is odd / poor imo

Adobe trying to maintain as close to a monopoly as it can on a file format in order to have more control and (at least hoping to) generate more revenue through that control... threatening legal action to maintain their control? It's not a strong argument to say it's people being mad about microsoft's own monopolism, rather it just speaks to how corporations acting with hostility via formal legalistic channels harms attempts to use an at the time proprietary file format. It's actually in fact a counter argument to what you wrote.

As for my stronger feeling against your sherlocking point, I'd note that generally people aren't mad about sherlocking because someone else does something good and it should only ever be done once ever by one person or group in history.

Rather, such anger is usually stemming from when it's perceived as a deliberate undercutting or lazy copying. When some person or group was far more innovative or did far more difficult initial design work, only to now have been so undercut without recompense by uncaring predators lying in wait.

A great example being video game modding. People are rarely mad if one game is simply implementing its own version of a feature popular in mods or another game.

Far more often are they angry because a modder's unique and beloved system just got lifted 1:1, or clearly was irrelevant and had no reason to be added to the base game even if it's popular, and yet they're not even cited as an inspiration or hired/paid/etc. by the company that obviously felt it greatly improves the value of the game.