Most of your questions are good for people with experience in this and since I see someone chimed in, I will leave those to others. Someone else who has been through the process might be able to tell you words to avoid or services that don’t work. One thing I can comment on is your question about other people getting away with similar gigs and gigs that cross the 30 day barrier.
The rules on Fiverr have definitely changed over the years and some things are clear in the Terms of Service while others are gradually implemented via “editorial focus” which means the Fiverr editors just fix things as they see them. There are tens of thousands of gigs in SEO type categories alone and some are very old while others are pretty new. It takes time for Fiverr to sort through them, so ones that are reported tend to get examined earlier. Newer gigs are sometimes taken down faster than very old ones since the sellers tweak/edit their gigs and that draws attention to them.
The bottom line is that you can find lots of gigs that violate the ToS or the current editorial rules. Once you know that something could become a problem, just avoid it personally. If you focus on other gigs you’ll drive yourself nuts. You can report them if you think they violate the rules, but tbh, Fiverr is more likely to pay close attention when a report comes in from a buyer who is unhappy or a 3rd party site like Google.