On Taobao, there are some sellers who provide PPT production services, but whether they are reliable depends on the specific situation.

Here are some things to note:

1. Evaluation and reputation: Before buying, you can check the seller's evaluation and customer feedback. If the seller has many positive reviews and satisfied customer feedback, then their service may be more reliable.

2. Work display: Sellers usually display some samples of their works in the store, and you can use these samples to evaluate whether their design quality and style meet your needs.

3. Communication and exchange: Before buying, communicate with the seller to make sure they can understand your needs and can make PPT according to your requirements.

4. Price and delivery time: Compare the prices and delivery times of different sellers and choose a suitable option.

5. Risk prevention: If you still have some doubts about the seller's credibility, you can choose to purchase a guarantee service, such as Alipay's guaranteed transaction or use the arbitration service provided by the platform.

In general, there may be good and bad PPT production services on Taobao, so you need to be careful when choosing. It is recommended that you fully understand and communicate before purchasing to ensure that you can get the service quality that meets your expectations.