If so, please give an example in the comments

no it does not lmao

Mine: imgflip.com/i/6j956o

Banning people was commonly suggested, so was memechat
Custom rules as well

Yes, quite a few suggestions have been implemented on the site over the years.

Very few of the suggestions actually get accepted, the last one which was accepted was the one which lets you filter the normal image templates and only lets you see GIF templates, i guess.

Rarely

they did like one (the ban update a year ago0

Yes. For example, Custom Icons (although not in the form most people expected) and a GIFs Only search filter were commonly suggested, and they were soon implemented.