My father in law had a mate who was diagnosed with terminal cancer. His wife had died so he sold his house, gave money to both his kids and pretty much lived for the 2 years they gave him. He was in massive trouble and ended up moving with my father in law because he went longer than the 2 years they gave him and died after 7 years.Why do you assume they were in their last few days? A terminal cancer diagnosis means the cancer can't be cured, it doesn't mean they're a few days away from death. They can often live for many months, or more than year, with chemo keeping their cancer at bay.
But if they were to contract covid, that life expectancy would likely be reduced massively and that's why it would be on their Death Certificate as a contributing factor.
I do have respect for people who've fought cancer. My Dad fought it for over a year with great courage and determination, never once complaining. You're the one lacking in respect by acting like a terminal cancer patient is at death's door and therefore implying it doesn't matter if they catch covid - even though it could have accelerated their death massively. And all to score points on the internet. Very callous indeed.
My sister was diagnosed as terminal 8 years ago but weirdly is exempt from vaccine as it wont improve her quality of life and could potentially kill her.
Terminal definitely doesnt mean within hours or days