Because it could add a lot of issues, like the Porn users going around sharing their things, same w/ the Horny people.
It wouldn't be ideal.
Although the cons are low, the success is high, but it will cause a lot of problems regardless because we cannot report memechats(which should be an update in the future) at the moment, and that will be necessary if you join the wrong group or if you reach out to the wrong people(but you can delete your memechat comments however).
You might get brought into a group of pedo users while you might be younger than them(let's say about 5 or 4 years) and you wouldn't be able to report them at all since we can't, and we can't leave memechats either(which should also be an update).
Overall, it will be a lot harder to code and keep track of things, plus it'll make it like a imgflip version of a Discord Server in a way