Are we judging the time between updates as well, or just update day? Update day, I'll usually pick up between 1 to 5 on WEBTOON, and usually 0 to 2 on Tapas.
But over the two-week window between updates, I can get anywhere between 10 to 20 on WEBTOON if I'm promoting regularly on social media. Tapas just seems to have subs trickle in at random, I'll get maybe 5 to 10 over two weeks.
I actually uploaded on an 'off day' this week (yesterday) because I was just tossing up a Q and A, and that got me more 'update day' subs than I've seen in ages. Around 9. Probably because the people who check WEBTOON on that day had never seen my comic in the 'newest' list before.