“Ten times closer” is pretty unambiguously 0.1. What starts getting more confusing is “300% further” which is technically 4 but many understand as 3 (try replacing by 50%, 50% further is 1.5 not 0.5). Also “50% closer” being the same as twice closer while 50% further is only 1.5x further can get confusing too, and it gets even worse with “50% slower” - is speed now 1/1.5 (= it takes 50% more time) or 0.5/1 (= speed is reduced by 50%) ?
“This” comments (on Reddit and Lemmy) are not a bad thing. An upvote is supposed to promote valuable content, not necessarily stuff you agree with. A “this” shows agreement. These are different things, and hunting down the “this” promotes the “upvote to agree, downvote to disagree” mentality.
(For example I said “this” to one comment on this thread, which was an unpopular opinion I agreed with. I upvoted plenty of other opinions I found interesting (and actually unpopular) while not necessarily agreeing with them.)
And, in the other direction : lose.