Does Apple deliberately slow its old models before a new release?

[Zapotec]

Does Apple deliberately slow its old models before a new release?

http://www.dailymail.co.uk/sciencetech/article-2709502/Does-Apple-deliberately-slow-old-models-new-release...

Searches for 'iPhone slow' show a spike ahead of launches

- The study was undertaken by student Laura Trucco at Harvard University
- It also compared Apple's results with searches for 'Samsung Galaxy slow'
- Research found that the term was unaffected by Samsung new releases
- Study has fuelled suggestions Apple engages in ‘planned obsolescence’
 -Theory states that manufacturers build in a certain lifetime to a product and then it will simply stop working, forcing consumers to buy a new one