That Reijnders tackle was intentional step on someone's foot for the purpose of twisting the ankle. A very, very dirty thing to do. He got to the ball first. Kicked it. And then went on to make sure to step onto the opponents foot. That was a yellow. That was, also, with intention.
Fulham's stepping on the foot instance yesterday was unintentional.*
* That is my impression. But, football players might be very, very dirty nowadays. And the Fulham player may very well have intentionally made sure to step on the opponent's foot. That may even have probably been the case. He did kick other foot's heel in the direction of the opponent too - if I remember well. The sport of football has really degraded over the last few years. I've also never played football professionally. But recreationally I would say that I do have great experience playing football. All such stuff is unheard off in recreational football. There are fouls on purpose but among children/youngsters. In my experience. Absent manners and a culture of decency and decent behaviour it will always be impossible to come up with rules to root things out.