mempool filled with op_return transactions

What is the reason all the projected blocks for the near future contain so many op_return (often used for data storage right?) transactions which are all a similar small size. I remember looking at it a few months ago where blocks were filled with many transactions of different sizes. What is causing this?


https://preview.redd.it/4muqvxljr58d1.png?width=560&format=png&auto=webp&s=c02b58eef98bb2378e015885957968e694475195 submitted by /u/DesperatelyAskReddit
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http://dlvr.it/T8dRmx