Even if the internal discussions were "other services do this and we want a piece of that pie", no company is going to come out in a product launch announcement and directly say "another service is doing this and we want a piece of that pie".

And in this case, I would still hope they did do market validation internally, even if it is just a copy of wetransfer. Just because some other company is doing something doesn't automatically mean it's a good fit for your company to do it, too.

As for the design, it's pretty hard to say that "a generic file selection panel in the middle of a page and a Sign Up button at the top right of the page where it typically is on most sites" is a "straight up clone". The color schemes are similar, but that's just because the main color branding of both companies happens to be light blue.