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Stylish has been removed from the add-on stores for permanent spying on users - no information whether a version with no tracking or with a very smaller tracking and default disabled (for activation for willing / courageous).
If you real want Stylish you mast to install manualy:
A version (versions actually, not just one) with no tracking or with a very smaller tracking exist but it doesn't allow you to use the search function (which is necessary considering how they made the search on USo totally awful and 99% of people use it to search/install userstyles that way) without enabling the analytics, so you'd be giving them all your data with your consent!!
Just go ahead and install Stylus since it has far better features and doesn't collect your entire search data.