I mean a checkbox or so in the options for "watch tournaments spoilerfree" would really not be that much work.

I would prefer to simply see match 1, click here, match 2 click here. And ofcourse for the first round you could have all the names visible but for the 2nd round I don't want to see who already advances cause that ruins all their games they play in round 1 since I know they will win all or most of the games since they are already in round 2.

Watching the IT 2 was pretty good since you couldn't see that much of the rounds but unfortunally that was spoiled aswell when I started up the test server and saw very big XXX has won including picture/flag and everything.