Another Social Media and a hyped site goes down

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Last year, Bubblews went down and Wikinut stopped paying. Then this year, Blogjob also went non-paying. Now as per the update, Tsu is also being taken off, though those who are above redeem limit and contest awards will be rewarded as promised. What do you think could be the reasons for sites closing down or stopping payouts? Lack of planning, dishonesty, or something else?