If you look at the source between your post and the OP of this chain, you can see that they haven’t got any special link formatting, but the links will all work correctly for any lemmy user no matter their instance - not sure if kbin handles it correctly.
e.g. [!destroy_my_game](https://programming.dev/c/destroy_my_game) vs !destroy_my_game@programming.dev
I suspect it’s just a convenience thing, since a number of your links point to kbin.cafe search results.
I think Lemmy uses ! for instances because @ is used for users - e.g. I expect that @floppy will automatically link to your profile on your instance (and link to your profile on any other viewer’s instance - e.g. for me it should link to an aussie.zone URL).
It’s probably a design decision to differentiate communities from users.
Since you’re posting to a lemmy instance (beehaw), you should probably use the lemmy style - i.e. !community - I don’t think there’s any need to create an explicit link since I think most UIs will format it for you.
Blizzard aren’t worth going out of your way to defend with a review, but the game is fun enough that people playing it are probably doing just that - playing the game.
For my part, my friend group have played pretty regularly since OW1 released, and continue to do so. The game has its problems but they’re no more egregious than the ones in games like Apex or PUBG, and certainly not bad enough to put it in the same league as all the hentai crypto mining asset-flips littering Steam these days.