It's a lot easier to get a driver's license than it is to get citizenship, AND, you can get it and registered in a matter of hours, days or weeks rather than years.
It’s been a good 25+ years since democrats began efforts to register college students to vote in the communities near campus. There is no doubt literal millions of registered voters on the voter rolls from those campaigns whose votes are cast for them many years after graduation. During their education, many likely voted locally AND back at home in the same election cycle. It’s very hard to push back against democrat strategies at election fraud.