With term life insurance specifically the lifetime policy premiums are typically so low relative to the value of the policy that there's a natural bias towards insuring generally healthy people. Its not uncommon to see policies that are something like $40/month for 20 years ($9600 in premiums) for a $1mm death benefit, for example.

People with more complex medical conditions often can get life insurance from smaller, specialized providers... and at much higher rates. But the big mass-market players offering inexpensive term life products are only offering them that cheaply because they really control the risk profile during underwriting.

Insurance companies only make money, when they insure people..