Intentional and systematic delays

There are three players on the European server who in every ToT match make the move and then let the time run down to the last thousandths of a second to pass their turn. These three players always do this systematically. They are always the same, so I assume they are already known by everyone. I know it's not outside the rules, we have 90 seconds per play, and they always use 89 seconds, so it's in the rule. However, they force us to give up frequently because we already know that the game could last more than an hour, it takes patience and a lot of availability. We know that if a player lets the time run out completely, then the time is reduced on the next turn, but they also know this, so they always end the turn only in the last few thousandths of a second, to prevent it from happening. Two of these players usually hold up well in the top 10% and one of them even in the 2%, which means it works. When I have the time and patience to carry this boredom to the end, I always end up winning, so they aren't even good players that justify the position in the ranking they get. These three players are already on my ignore list, and referenced so I know in advance what I'm counting on, so I can also give up right at the beginning, when I don't have much time. My question, knowing that what they do is not outside the rules, is what could be done to prevent this type of exploitation of the rules of the game. Could it be possible to penalize these players, not allowing them to participate in the following season, when this systematic attitude is detected? Have you ever experienced situations like this? How do you react? Do you give up too? What could be the solution?