Universities have deliberately come up with the idea that they no longer require GRE scores. All this is done in order to achieve more applications from students, which means a large amount of money in the form of an application fee. Instead of paying $205 and $150 for the GRE general and subject tests, universities want that money to be spent by you in the form of application fees. They deliberately came up with such a lure to get more money from students.
Every student has research experience and everyone can write a beautiful statement of purpose. From about 500 applications, will select only 30-40. Each professor at the university can take on average only 1 student to his research group. Therefore, the selection committee will select students on the principle of a lottery. And they don't care about you if you don't get in and wait a whole year again.