This is a good move for people who don't have much money to begin with. But the downside of this micro Bitcoin accumulation is the increasing Bitcoin fee if each purchase is directly transfered to the holding non-custodial wallet. So it is best to accumulate the Bitcoin amount to an exchange then withdrawing it when it reaches a certain threshold like 0.001 BTC or 0.01 BTC. This way, accumulating Bitcoin and keeping it in a non-custodial wallet will not require huge amount of transaction fees due to the accumulated transaction weight of several different incoming transfers.
One of the key Takeaway from all this is to correct the notion that has limited so many persons especially the newbies which is that- Bitcoin accumulation is only for the Upper Class.
I disagree, people are well-versed enough that they can purchase a fraction of BTC. I believe those who promote Bitcoin are open enough to disclose that Bitcoin can be purchased in fractions. So people who first heard of Bitcoin can have the knowledge that they can buy Bitcoin in small fractions and the knowledge about that are well spread out in the internet.