@campacavalloscacchi : Your question has been asked several times. I am sure, that the limit has nothing to do with storage capacities. But things like that can slow down the whole site substantially. If they increase the limit to for instance 1000 players, then surely many players will use this limit. And all these players get constant notifications about their thousand followed players.
This is not a hypothetical discussion: You probably don't know this, because your account is four months old. When OTB chess faded away due to well known reasons in March 2020, Lichess gained much popularity, the number of active users exploded. One year ago there were often roughly 20.000 active users, now we are over 100.000! For a few weeks there were serious problems especially during big tournaments, the site even crashed several times. They had to buy new hardware to handle the increased number of users.