Google Books is probably a not very well known and used service by Google. It offers a storage of your books allowing you to access them digitally from any device. Replacing it is not that difficult.
2020 is the year when PHP will change versions. The latest and greatest will no longer be 7 but 8. It is sad (kinda) since we will no longer be using a prime number as the latest version of PHP, which has additional significance as a number (here I am showing my nerdiness). There are 7 oceans, 7 continents, 7 layers of skin (2 outer and 5 inner), ocean waves roll in sevens, the rainbow has 7 colors, sound has 7 notes, etc. etc. Instead, we will be using 8, infinity rotated by 90 degrees.
Google Photos offers one of the best - if not the best - photo managing and sharing service on the Internet. Finding a suitable replacement proved to be a big challenge.
Google Maps is very convenient and accurate. It helps us with finding places and it is an integral part of the Android operating system.
Leaving Gmail is difficult. In some cases impossible. Google with their thousands of employees and years of experience in the field, have created an excellent product that definitely helps people throughout the world. The features offered are excellent, mature and time saving.