Purchased tokens should not expire monthly

I purchased tokens expecting them to be a permanent asset, similar to buying cryptocurrency. I was disappointed to find out they expire monthly. I believe that once purchased, tokens should not expire and should remain in my account until I use them. This would make the business model feel more fair and less confusing, improving customer trust and satisfaction. It feels inconsistent to have a subscription model mixed with a token-based model where the tokens I buy outright just disappear.