Is affiliate marketing worth it in 2021?

Yes definitely!
The commission you earn from affiliate marketing depends on the niche that you choose.
If for example, you speak of Amazon, you can earn between 12-4% depending on the type of product you promote.
Some luxury products can earn you much more.
If you have good traffic which you can convert to buying the products through you affiliate link, then it is good earning.

It is worth it in my opinion, not because it is easy money or because anybody can do it.

The reason for this is that affiliate marketing allows you to do a number of things you dont do:

1. Investigate how a market operates.

2. Research information about how to sell items to individuals.

3. Gaining marketing experience, even if you don't think of it that way.

4. If you keep researching, gathering knowledge, and pondering what to say, you'll be able to sell anything in no time.

5. They reward you for your efforts in learning and assisting them.

Good