Tanking is a "problem" that exists almost since beginning of this game.
Personally, I don't think it's problem for Nordeus. If it was a problem, they would solve it many years ago. I think tankers are hidden motivator for normal managers to donate. Plus It's very hard to make rules that will affect only tankers and not normal managers and also not those managers who are on top of the of their servers.
Many managers suggest to remove 20% no matter if team promoted or not. It's because they don't understand clearly how percentage works. Percentage is just relative value of a player according to club level. Based value of a player is in parens () and only can increase, but not decrease.
I don't think Nordeus will hear us, but let me tell you my idea of how they can, if they want, solve tankers problem.
First of all, that new idea with tickets only for Top 8 in League to participate in Friendly Championship can be extended to another Special Events. This way if your team is not good enough, or you dumped League last season on purpose then you're not be able to participate in any special events, like King of the Hill, etc.
The second is about Football Associations.
Not allowing for those who was behind Top 8 to participate in FA would create such chaos.
I suggest to NOT COUNT winning/draw FA MATCH POINTS from those teams who finished behind Top 8 in sum of points for reward.. But count only towards FA win/lose.
So, for example. If FA has 2 tankers and 4 normal managers, and in semi-final they won all games (home and away), then they get only 24 points (not 36). But still advance to final (because all games won). If in final all 6 teams won home and away games again, they earn 24 points again. They win tournament, but amount of points would be 50+24+24=98, instead 50+36+36=122.
And of course any team who won Champions League or Cup get reward, which is promotion.