First off your comic is gorgeous, and I don't think it should have to change just because Tapas and Webtoon are addicted to scroll format. But, it's up to you. Overall, my experience with doing a page format comic for years on this website is that there's just very little support for it. It's discouraging, and I wish that Tapas and Webtoon would give us like a separate place on this platform. But alas, most of our readers are on their phone. Which is wild to me. But everyone is different.
Me, personally, I decided to finish my current comic in traditional just because I tested it out and it was lackluster both as an end product and in how freakin long it took to remake a page I already drew once. It sucks a lot to redraw something you already drew once and not get paid for it. So I opted to just...ignore the fact that scroll format exists for this one. Maybe another comic, once I finish this one.
But like you just started so you could easily just make the rest of your story vertical from here on out. You only have one episode. You may not have to start anything over. A lot of comics have beginnings that are page format that eventually become vertical format later.