Some people are using "just looking for friends" as a filter. They want the person who talks to them to be ok with being friends first before they switch to being romantic.
There is often an element of self-deception too. "I'm not the sort of person who would use a dating app, I don't need it" You see a lot of "I'm just trying out this app to kill time" people too.
Other people use it as a built-in refusal. They can say "Sorry, I'm just looking for friends" when they are asked on a date by someone they aren't interested in. When someone more appealing asks them out no one will complain that they aren't following their "just friends" rule.
Dating is full of interesting meta-behaviour like this.
There is often an element of self-deception too. "I'm not the sort of person who would use a dating app, I don't need it" You see a lot of "I'm just trying out this app to kill time" people too.
Other people use it as a built-in refusal. They can say "Sorry, I'm just looking for friends" when they are asked on a date by someone they aren't interested in. When someone more appealing asks them out no one will complain that they aren't following their "just friends" rule.
Dating is full of interesting meta-behaviour like this.