There’s a very good post from the RedReader app developer (another open source Reddit client) about this issue for their app: https://old.reddit.com/r/RedReader/comments/132qkb8/update_2_reddits_proposed_api_changes_and_the/

I am solely using Infinity. I buyed it form Play store to support the development. I don’t want another closed source (untrustworthy) app on my phone. Maybe we can use individual API keys for accessing Reddit. (And have Lemmy access in the same app)

I love Infinity and will really miss it. I understand that Reddit is a business and wants to turn a profit , and I’d be willing to pay for Infinity so that Reddit could get their money but it looks like what Reddit is asking is just completely unreasonable