Bitcoin is nursing losses after its worst weekly plunge in almost a year and on one view its longer term outlook could be even worse because of environmental concerns and tightening regulations.

The sheer amount of energy needed to mine Bitcoin and the prospect that governments will create more obstacles for the largest cryptocurrency point to the token losing “most of its value over time,” BCA Research Inc. said.

The expense and slowness of Bitcoin transactions make it “unsuitable as a medium of exchange,” BCA Research Chief Global Strategist Peter Berezin wrote in the report released Friday. In addition, environmental, social and governance-focused funds are likely to shun companies associated with Bitcoin due to the large energy consumption by miners on computer networks.

Bitcoin is still up more than five times over the past year, a divisive rally pitting believers in a new asset class against naysayers who see a speculative bubble. Among notable recent developments are Tesla Inc.’s $1.5 billion purchase of the token. At the same time, Microsoft Corp. co-founder Bill Gates and Treasury Secretary Janet Yellen are among those signaling caution.

Governments will create more obstacles because they could lose billions of dollars in revenue from seigniorage — the difference between the face value of money and the cost to produce it — according to BCA.

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