To elaborate a bit more on my picks -- with the changes to the reward system with Katowice 2019, where each stage is now 'x correct picks per stage' as opposed to the culminative total point goal of the past, you are now rewarded for being cautious instead of taking risks. This means that it is pretty much now pointless to guess a sure-thing team as 3-0 in the case that they get upset, because you will miss out on a point that you would get otherwise for putting them in the bottom section. This is because for the Legends stage, you only need 5 correct picks to achieve the requirment for this stage. With this in mind, it is nothing less than in your best interest to put your 3-0 as a random team that has the potential to achieve it (for example this year: ENCE, renegades, NRG), and for the 0-3 it can be any team you expect to not perform well, such as CoL who have played terribly up to this major so far this year. The new ELO seeding system heavily favors top teams this year, and ironically this system is what will save a lot of peoples Pick'ems as well. A good example of this is fnatic, being a team that was expected to do incredibly well coming into the major, recieved a very high seeding going into the Challengers stage, and were picked to go 3-0 by many people...but played like shit and didnt qualify for Legends...but people picking them for 3-0 was ironically a good thing because it didn't affect their 'other 7 teams who will advance' section.
tl;dr = dont pick obvious sure things for 3-0 or 0-3, put those teams in the bottom 7 area