Find great companies at good prices and the destruction of moats

Hi All,

I wrote a short article about 10 companies which have/had moats in the 90s. Hoping to promote a discussion about the matter if the following 10 companies.
My article as follows: Stalwarts and moats

1. Singapore Press Holdings
2. Singapore Post
3. Singtel
4. Comfortdelgro

5. Keppel Corporation
6. Noble

7. Singapore Pools (not listed, but just here to illustrate a point)
8. Singapore Technology Engineering
9. SATs
10. SGX