It's sickening that that is so clearly a target for them: people - often elderly and/or vulnerable - who don't need a licence, but who are so frightened by their harassing and menacing letters that they pay up anyway.
In effect, not much different from a 'protection' racket run by unsavoury characters - except that the latter aren't government endorsed.
One thing that I don't think received anywhere near enough exposure - probably because it affected elderly people, and society is habituated to simply ignoring their needs and circumstances anyway - is what happened after the previous government scrapped free TV licences for people aged over 75.
My DGM - in her mid-90s - had not had a TV for over a decade, as she had multiple severe mental health problems and one of these presented in paranoia, whereby she thought that the TV was watching her and the presenters talking to her personally. Not only was she not interested in watching TV; the very idea of it terrified her.
After my DGF died, they continued to send her free TV licences, which were obviously useless for her and just got shoved in a drawer or thrown away and treated like any other unwanted mail.
However, once over-75s had to start paying for a TV licence again, it was naturally assumed by TVL that they were all still watching TV and thus were told they were criminals and threatened if they hadn't instantly gone and paid up.
Never mind the older folk who didn't watch TV, those who weren't aware about suddenly needing to pay again, which would have confused many (after all, once you qualify for your state pension and other old-age related benefits and schemes, you get it for the rest of your life; it doesn't just run out and stop), and those who had moved into care homes or died.
Even if they had bothered to make it very clear that you may well not need a TV licence - to a generation who had largely long seen it as an essential bill and not a consumer choice - it isn't always as straightforward as "just let us know and we'll pretend to remove you from our database, except we will assume that you're lying and continue to harass you regardless".
Many elderly people are not online, those with hearing or cognition issues will struggle to use a phone, and even if they're willing and able to spend £2 or whatever on a stamp, if they're housebound and/or frail (or it's icy outside), even getting to a postbox can be far from simple.