ABSOLUTELY NO!!!
Other websites with karma are full of bots who repost, a few year later, the content that was popular in the past, in order to mine reputation.
Karma also creates an echo chamber with self censorship where people won’t post anything unpopular out of fear of loosing karma.
I like diversity of opinion. I don’t want facebook, I don’t want to read my opinion with a different phrasing.
Everybody is talking about the GPDR, but the GPDR when hosting in the EU, should be the least if your concerns. As I said elsewhere:
The real issue is Directive on Copyright in the Digital Single Market which is a nightmare if you want to host lemmy legally. Realistically, the government don’t care about a few copyright infrigement by some guy/gal hosting a lemmy instance in their garage.
But, if you want to follow the law to the letter, the EU doesn’t have any fair use. So theorically, you need to allow users to only post creative commons images, with attribution. Or do some copyright checks on the content posted on your instance. Here is an EU video on how to comply with the directive, it’s a nightmare.