Does Lancaster Uni care about your attendance? Watch
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My other son’s Uni has a register at every lecture and they take a hard line over unexplained absences and call you in if you miss 2 lectures in any given week.
I think in both cases they are keen to avoid students falling behind, dropping out or suffering with mental health issues on their own with no support. This pastoral caring aspect from the Uni’s is a good thing.
What will happen will depend on your department. Some will flag your attendance if you drop below 80%, other's will just let you do what you want unless you're failing.
That all being said, going to lectures is a good thing. It will help you to get better grades at the end of the year.