I believe we had a similar thread earlier last year, where someone's comic was blocked on Webtoons. But the topic did come up that the country themselves might've done the blocking instead of Webtoons. The reason for them was possibly 18+ content in the comic.
Again, it'll probably help you more to contact someone directly from Tapas before we assume the worst. If it is from their side, they'll have a likely answer. But if it's from your country, it might be out of their hands and you might have to consider a VPN.