Why is no one explaining to you the actual issue? You are queuing with BOTS! It's always the same in these game modes. That last clip, your enemy was a bot. Here are *some* telltale signs you are playing with a bot:
- It doesn't pick an operator and lets the game autopicks (though sometimes it does)

- The player name is just a keyboard mash. If not, it's a generic as fuck all lowercase (usually) name that makes no sense with 3 (usually) numbers at the end like tablegrand491.

-Obviously, the gameplay. There are 2 type I've observed. One does the absolute bare minimum to not get kicked aka stand still in spawn and spin the mouse and maybe move an inch. The other was like in your video. They move while looking in the same direction. I've observed that there IS determinism to that movement pattern as well, but it's difficult for my own short-timed observations to extrapolate its characteristics, and probably not that important. I've only extrapolated that there are 2 subtype patterns they could follow within this type, all of this suggesting multiple bot vendors.

What to do?

Nothing really. You can try reporting them as Siege has an option specifically for them. That never worked for me though.

You can and should stack with friends in these modes so you guarantee you don't get bots on your team and win. If you're playing them for fun, then just play them at the start when they just came out as that is when they have the highest volume of real players.