Many shorter Ullu-style web series are available on MX Player for free. While you won’t find the exact "Charmsukh" episodes, MX has a massive library of bold originals that are legally free.
Because the official Ullu app requires a login, pirates have created dedicated sub-sections to cater specifically to that audience. The term "Xmaza Ullu" has high search volume because Ullu’s content is frequently updated, and pirates race to upload new episodes within hours of release. xmaza ullu