I very much doubt that. In most EU countries sick days are limited to 90 days, after that a panel of doctors will examine your case and move you to disability pay for example, as you can't just be on sick leave "unlimited".Here in the UK we can "self-certify" sickness for anything less than 5 days. If you're ill for less than a week then you just tell your boss you're ill and don't come to work. You're still paid. If you're ill for more than 5 days then you need to get sign off from a doctor. You're still paid for the time you're sick. If you're ill for several weeks or longer then you move to "statutory sick pay" which is usually less than your salary but some employers will still pay you your full salary. If you're off work for a really long time (6 months+) then most employers will negotiate with you to resign.
At no point are you ever really in danger of losing your job though, or being forced to return to work. Employers are mostly pretty good about it, especially in tech.
In theory I could be genuinely ill every other week for a full year and self-certify 26 individual weeks off without needing to visit a doctor or losing my job. In that sense, we absolutely do have "unlimited" sick days.