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When implementing a recommendation system based on tourism data, there is an expectation that tourism trends will change in a few years and the model's accuracy will deteriorate. In that case, why would implementation be inappropriate?
①There is too much initial data.
②It's highly likely that the user won't use it.
③The model's degradation and ongoing operational costs aren't worth it.
④There is strong political pressure regarding the decision to introduce it.
⑤There is no open source.