That's all true. I'm just saying if they knew that you needed this app to get them flowers, then a.) they would likely feel a bit disappointed vs. if it was all you, and b.) that is not unreasonable.
In receiving flowers, the value the recipient gets is not so much the flowers themselves, but by what the gift betrays about your mind state. This authentic information about your mind state is what makes the act “real”.
So it is reasonable to consider the act less real or even a bit deceptive if the mind state that you’d first expect the act to imply (they care about me and thought to get flowers) does not reflect your true mind state (they cared about me enough at some point in the past to set up this app).