Great question! Most unblocked game sites aren't run by the original developers - they're usually third-party mirrors or modified versions. That's why you're noticing missing features and glitchy ads.
Here are the main risks with random unblocked sites:
- Security concerns (some inject malware or tracking scripts)
- Missing features or outdated versions
- Unstable gameplay from poorly maintained code
- Ad bombardment that can be sketchy
If you're looking for a safer place to play browser games at school, I'd recommend sticking with established educational game sites. HoodaMath.com is actually classified as an educational site (so it's usually unblocked) and has tons of free browser games - everything from puzzle games to escape games to racing. The .com domain is legitimate and they don't have the sketchy ad problems you see on random mirror sites.
For BitLife specifically, if you want the full experience, you're better off playing the official version on a personal device. Browser mirrors will always be incomplete copies.