All these methods are part of what is known as black hat SEO or spamdexing.
Social networks and s change their policies frequently (neither you nor any SEO expert has control over this). https://WWW.Iemag.ru/bitrix/rk.php?goto=https://telegra.ph/7-Reasons-As-To-Why-Your-Web-Site-Needs-Seo-Service-06-27