After kicking around between Tapas, Webtoon and Webcomics app for a couple years, here's my sub numbers for all my comics. (spoilers: my Tapas numbers are sad)
The Princess is a Total Devant (Started in 2017)
Tapas: 1.3k
Webtoon: 77.3k
Webcomics: 75k (probably inflated)
Path of the Fallen (Start in 2018)
Tapas: 318
Webtoon: 7.8k
ES Webtoon: 6.1k
The Rose Prince (Started in 2020)
Tapas: 502
Webtoon: 34.9k
ES Webtoon: 12.9k
I would say the only times I see any significant growth on Tapas is from a promotion or if a comic miraculously gets on the Trending list. (So like, maybe once a year if I'm lucky lol)