You have better options than Testlio
After being with Testlio for over three years, I can only recommend it to people who are interested in learning the field of QA.
There's good at Testlio, they are working on the platform to be more user friendly. It's simple to apply for work and the bug reporting framework is fluid. Most importantly they provide alot of material to learn from.
However, the way the company is operated is completely unreasonable. There are server issues, communication issues, irregular scheduling, and sometimes even payment issues. All of these things while the hourly as that of a Walmart worker.
All of these things can be annoying, but forgivable. The main issue is that as a tester, you're expected to be perfect in a imperfect system. Everyone above you can make mistakes and arbitrarily alter things. But Testers are replaceable cogs in a machine that pretends you matter.
Many TL's in the company are more focused on punishing testers than actually identifying bugs for clients. I've worked so much unpaid overtime reproducing bugs. I invested money into devices we were missing for runs. I helped other Testers who needed guidance. I went the extra mile for years on end. I took pride in the work. In the end, the smallest of details that could've been resolved within minutes had me terminated.
I can't even find the anger in myself over this because I no longer respect Testlio to even feel the loss. There are plenty of good individuals in the company, but there are people who are rotting it from the inside. The company is accountable for this because the isolating policies enables it.
All in all, if you want to learn and gain experience in QA, testlio is a accessible option. I cannot recommend it to anyone beyond that. If you can do this, you'll get much more value for your time elsewhere.