I completed my 2020 US census survey on my phone. The census is what we use to decide how many representatives for congress each state gets and how much federal funding each state gets. It seems to me that if it works for something as important as the census it should be safe and functional enough to use for elections. Simple verification, simple survey voting questions and then completing the vote. Also, IMO it would be easier to track any fraud if it exists than mail in ballots and machines.