True, but from what I've seen most artists don't really seem to get that the problem with Tumblr is its interface and the kinds of people who share these comics tend to blame the viewers directly with these whiny "WHY DOES NOBODY REBLOG" rather than complain about the actual website structure - hence why almost all of these "likes<reblogs" comics and PSAs never seem to focus on actual frustrating things about Tumblr like how its back-asswards search system means that its pretty much impossible to find anything even with an account, or how the setup for dashboards means that finding new artists is more about luck since the only options are to attempt to navigate Tumblr's broken search engine or hope someone in your hugbox reblogs an artist you aren't already following.
Like I said with the last one, I don't think it's a healthy mindset to be constantly scrutinizing the type of feedback you're getting because, from what I've seen, it's created this environment where artists on Tumblr seem to resent their own fans because they don't provide a certain kind of feedback, and looking at someone giving a like and going "Is that all?" rather than examining the hows and whys just breeds this atmosphere for whiners and entitlement - which is especially toxic for beginners.
That particular comic in my opinion kind of encompasses that attitude Tumblr seems like it's been breeding lately, and the number of 20 and even 30-somethings I see reblogging these sorts of comics when they should really know better with commentary along the lines of "YEAH IF YOU DON'T REBLOG THEN WHAT GOOD ARE YOU" isn't helping.