I think you'll agree, this sounds like a broken record. It's pretty easy to spot, and Google will be able to tell if the content doesn't sound natural.
You may have heard the joke “An SEO copywriter walks into a bar, grill, tavern, public house, Irish, bartender, drink, beer, wine, spirits…”. This joke is about keyword stuffing, which is another perfect example of practice. but they have no value because they don’t even string together a sentence.
You can do keyword research to find out what people are searching for, but it’s not a good idea to overuse these keywords in your content. Instead of filling your content with irrelevant keywords, focus on creating useful content that focuses on topics instead of keywords.
camouflage
Cloaking involves showing one piece of content to estonia mobile database users and another piece of content to search engines. Websites practicing black hat SEO do this to make the content rank for various terms that have nothing to do with its content. Spam websites often do this to avoid search engine bots from discovering the spammy content they are serving to users.
It's acceptable to customize your content for different user groups. For example, you might reduce the size of your site when someone visits from a mobile device. You might also change the language of a page based on the country someone is visiting from. Publishers like Forbes or Inc might change the ads that appear on a page to fund their content. These examples are perfectly acceptable. As long as you're not just changing the content that's displayed by search engine crawlers.