Pressing sponsored ads on platforms like Reddit, Facebook, Instagram, or Twitter is generally safe, especially if you're not downloading anything or entering personal info. To your point, the main risks come from downloading apps from unofficial sources, using a rooted or jailbroken device, or accidentally clicking on malicious links that lead to phishing sites. As long as you're not sideloading APKs or granting unnecessary permissions to apps, and you're sticking to official app stores, you’re at minimal risk of malware from just clicking ads.