Hey Knesia,
Often came across that question on my journey. Or more precisely “What if any competitor does the same”.
Although Google forms never went the ‘Typeform way’, most form/survey product followed suit eventually with the “One question at a time” format.
It’s generally hard to protect IP with Saas products, so my best answer over time has been to push forward as fast as you can and show your backside to your competitors (“let them see your ass”). Like this they are always copying whilst you are focusing on innovating and getting there first.