Soft inquiries do not negatively affect your credit score.
From Credit Karma:
Soft inquiries typically occur when a person or company checks your
credit report as part of a background check. Examples include employer
background checks, getting "pre-approved" for credit card offers and
checking your own credit score. A soft inquiry may occur without your
permission. Soft inquiries may be recorded in your credit report,
depending on the credit bureau, but they won't affect your credit
That being said, the examples you provide may actually result in hard inquiries on your credit report. The CLI seems the most likely case where a hard inquiry will result rather than a soft inquiry, and I've read where Comcast will do hard inquiries as well. If you Google all three of your examples, you'll find cases either way. Each bank, credit union, or cable provider will behave differently, so it's difficult to predict what type of inquiry, if any, will occur.