How is Topmate not considered Moonlighting?

For TopMate you aren't building things for a company which may be your current employer's competitor. Also the time required is lesser and can be managed by a person having full time job, while a part-time/freelancing opportunity comes with the possibility of a person prioritising that over their current full time job. That's why companies are okay with it.

Strictly speaking, you’re not signing a contract with Topmate for delivery. So, it doesn’t come under the gambit of moonlighting. When you’re freelancing, there is almost always a contract, which most companies might consider moonlighting. But if you read your company policy, they can easily twist it against you and say Topmate is moonlighting! The wording is intentionally vague :D

It’s like the sukha golgappa at end no? ;-) not much but still fun 🤩

I hope PF/UAN is not involved anywhere here.