I have done it a good couple of times already; I see a draw or a character that I like, so I visit the gallery of the account to see if there's more arts of the character or with the same style.
If I found that the account has a great amount of draws that I like, wether is an artist or a person who commission arts of their characters, I scroll through the gallery giving favs all around to all those draws that I like, and even comment on some if I have something to say, just like I would do with others draws I see online... and give a watch to the account if I like it enough.
It had never seemed to bother them, and some had even taken the time to thank me for the favs and reply to a bunch of all those comments I gave.
But now, an artist blocked me literally because I gave him a lot of favs...
I realized it when I was about to give a fav to the new art he posted, a while after I found him and gave the favs and watch; then it told me that I can't give favs to someone who blocked me.
I reached to the person's Twitter to ask him why did he block me if I just gave favs and good comments... he said that he basically thought I was a random creep who was spamming on every commission...
I explained that I was just... well, showing that I like the arts he made, and commenting as I would with any art... I mean, that's what the fav is for, right? To show that you like what they do...
I still apologized for (apparently) looking like a creep; he said "it's okay" but when I asked if he were gonna unblock me, he didn't want to...... he also blocked me on Twitter too...